JEE 2020 FAQ

# JEE 2020 - Students Queries, Experts Answers

##### 1How do IIT-JEE toppers prepare for the JEE ?

To be successful in JEE, you have to work hard and you have to be stress free during preparation. Analyse and work on weak Areas. Take a lot of Mock tests to boost your confidence and finally concentrate on the basic concepts.

##### 2 How many marks should be attained to get a 3-digit AIR in the JEE Main 2020 ?

For getting a 3-digit AIR in JEE Mains 2020, you should score marks above 270 out 360.

##### 3Where can I get the chapter-wise questions of the JEE Main January 2019 ?

You can buy Disha Publication 42 years IIT JEE question bank. Otherwise you can visit https://www.wileyindia.com/jee-main-solved and you can find chapter wise questions.

##### 4 What are the marks needed to get an AIR of 1,000 in the JEE Advanced ?

In 2015 for getting a rank under 1000 you need to score around 280 marks out of 504. But in 2016 for the same rank you need to score above 190 out of 332. It fluctuates year to year as per the pattern and difficulty level of paper. But if you score around 60% marks then u will get AIR under 1000.

##### 5 What is the weightage of the chapters in the JEE Main 2020 in the new pattern (75 questions) ?

For maths:

• Algebra consists of around 35% weightage.
• Calculus has a weightage of 33%.
• Coordinate geometry have around 25% and
• Rest is trigonometry

For physics:

• Mechanics – 35%
• Heat and thermodynamics – 10%
• Electrostatics and magnetism – 17%
• Current electricity and EMI – 20%
• Optics and modern physics – 18%

For chemistry:

• Inorganic – 30%
• Organic – 35%
• Physical – 35%

* This is an analysed data by analysing past papers so the weightage can be changed.

##### 6How are papers set by IIT Delhi for the JEE Advanced ?

Guessing the paper pattern of Advanced can be a dangerous exercise. IIT Delhi is conducting Advanced doesn’t mean that all the questions will be framed by its professors, there are professors from other IITs also. Paper organizing just ensures that management work will be done by that IIT.

##### 7What is the eligibility criteria for the JEE Mains for the Telangana state board ?

For NITs, IIITs and CFTIs admissions, the candidates should have obtained a minimum of 75% aggregate marks or be in the top 20 percentile of their respective boards. For SC/ST category, a minimum of 65% marks required.

##### 8What should be the rough estimated marks in the JEE Advanced for getting electronics as a branch at IIT ?

Pls refer : https://engineering.careers360.com/articles/iits-cutoff-for-btech-electronics-and-communication-engineering

##### 9How do I prepare for the JEE if I have studied only the NCERT so far ?

NCERT textbooks are the most crucial material to refer to JEE Chemistry. Almost 60-75 % of the questions are directly taken from the NCERT textbook for Chemistry. Questions from Physical chemistry, however, are easier to attend if you have learned the concepts and applications from somewhere other than just NCERT books. There are few chapters like Biomolecules, Polymers, Redox reactions etc. which, otherwise broad topics to learn from external sources, can be best dealt with through NCERT textbooks.  Plus on SpeedLabs website is very helpful in the preparation of JEE. It helps in: Easy to understand concepts, Save time, Self-analysis and Worksheets and Tests are provided.

##### 10How do I prepare for both the JEE Mains 2020 and the boards without coaching ?

First of all complete all the NCERT books on time and don’t underestimate that NCERT is very easy. The second thing is Chemistry is the easiest subject of all and you can score above 100+ in this by following NCERT book only.  SpeedLabs also provide good quality of questions for the JEE Mains and it will be helpful to tell about your weak areas in a particular subject.

##### 11 How useful is a DPP for a JEE aspirant ?

DPP’s are extremely useful as they are just your practice sheets and they are updated with recent examination. Just after the completion of a topic it helps you to understanding the topic and makes your grip stronger on the topic. But it is very important to keep a track of DPP's which most of the traditional systems fail to offer.

SpeedLabs has extended the concept of DPPs further by introducing DAP (Daily Adaptive Practice)

##### 12How do I prepare for class 11 physics for the JEE Main 2020 January attempt? What are some important chapters that have high weightage from class 11?

High Weightage, Low effort Chapters: Fluid Dynamics, Units and Dimensions, Surface Tension High Weightage, High effort Chapters: Rotational motion, Experimental physics and instruments, Centre of mass and conservation of momentum.

##### 13Is it true that studying the NDA syllabus will help me in the JEE Mains as well ?

If you are preparing for JEE then you don’t have to worry about the NDA exam and also for the SSB part, you will get at least 1-month time b/w your results and SSB so meanwhile Just buy a book for SSB preparation give at least 1 hour each day for your SSB preparation.

##### 14What should be the ratio of subjective to objective questions to be solved for the preparation of the JEE Mains and the JEE Advanced per day ?

There is no specific ratio for the subjective and objective questions. Approach for both types of questions is different. In objective part you can guess the answer from options, also get an idea about the approach to solve this. But subjective questions are for clearing the concepts.

##### 15What marks should I target for a 5,000 rank in the JEE Main 2020 new pattern?

You need approximately 170-180 (56%) in JEE Mains 2020 to get a rank b/w 5000-5500. Also, remember the criteria for 12th percentage (min 75%).

##### 16How early should I finish up with my IIT JEE syllabus?

• To complete your syllabus on time try to finish with your basic concept as soon as possible.
• You should finish your syllabus at least before 3–4 months so you can have a good revision time.
• After completing your full syllabus revision you can go for the mock test series.
• Here is some application which will provide you chapter-wise mock test series, previous year question paper, NCERT Solution which can prepare for your exam.
• These are an application which charges you nothing and can give a good benefit for your preparation IIT-JEE exam.
• The main point is: It depends upon the grasping power of an individual.

##### 17Is coaching really necessary to crack the entrance examinations like the JEE or the NEET?

Self-study strategy is the best to achieve what we want to achieve. It's good that you are focused on your target to be achieved. You need to be smarter to achieve it with self-study and you should start your preparation without wasting a single day and start with full motivation and focus.You must start with NCERT books for the basic and to prepare for NEET or JEE Mains. Do more hard work and follow a set timetable with strong determination power.  Almost all the students mostly go for online ways of learning (SpeedLabs) as it is the best way to elaborate the syllabus and we can watch videos related to our chapters when we want to study.

##### 18How do I study for JEE in 4 months?

Complete your syllabus on time. At least one month for revision and before 20-30 days of exam, solve as many mock papers you can.

##### 19Is a PCB student eligible to apply for the IIT JAM biotechnology?

In order to sit for IIT JAM exam 2020 for M. Sc. Biotechnology, a candidate must have Biology as one of the subjects in their 10+2 level and UG degree.

##### 20What are Common Preparation Mistakes of IIT JEE Advanced?

• Not following the NCERT books.
• Hard-working rather than smart work.
• Revision of the well-prepared topics again and again.
• Not clearing of doubts.

##### 21How can I score 250+ in the JEE 2020?

It is difficult to score 250+ in JEE Mains without coaching but not impossible unless and until you are a dedicated student.  Tips: Focus on Specially Inorganic Chemistry, make your own notes from NCERT book. Solve at least 2 full-length mock test in a week. Books to follow

##### 22How do we come to know if the image uploaded in the JEE Mains 2020 form has some discrepancy in it?

Following are the Photograph and Signature specifications for JEE 2020 form

 Specification Photograph Signature Format JPEG or JPG JPEG or JPG Size 10 kb – 200 kb 4 kb – 30 kb Color Black/ or colored (both allowed) Other Specifications Should be of good contrast

The reasons for the photo discrepancy are:
• The Photo may be burred
• The image might not be as per specifications
• The background is not acceptable
• The specs worn by the candidate may have shown a red eye
• Signature is not clear
• Signature is in capitals
• Image of signature is not as per specifications

You can remove discrepancy in JEE Main 2020 application form by following the steps given below. These are simple, easy to do steps. However, if you want, you can ask your parents or teachers to assist you.

Step 1 Go to jeemain.nta.nic.in. Please note that this is the new official website of the Joint Entrance Examination (JEE) Main.

Step 2 Click on the link “remove image discrepancy”, which you can see under current events. If you cannot see it then that means that image discrepancy removal facility is not available at that time.

##### 23Was the JEE-Mains of April session tougher than that of January session?

There would be easy as well as difficult questions in the January's and April's JEE Main papers. It is possible that difficult questions would be from different chapters in both of the JEE Main Paper. NTA will maintain a standard and prepare the question papers.

##### 24How early should I finish up with my IIT JEE syllabus?

• Try to learn from your mistakes: Analyse the Practice paper (mock test or previous year) after writing the paper. Keep a track record of all your practice papers, revise the topics that may act as your weak links. Do the deep analysis of your paper. Check the right answers and wrong answer separately, find your mistakes in the paper. Try to look at the solved papers and try to think where you went wrong.
• Make chapter wise notes (only important things like formulae and key concepts) so that you can revise the concepts without wasting time. It’s better if you refer some of the online material or booklets provided by some of the ed-tech portals. (one of many portals available is speedlabs.in)
• JEE is structured not only to test your knowledge and concept prowess, but also the mental toughness, be prepared to get surprised a couple of times during the paper, bet keep calm composure towards everything, believe in your preparation. Solve one question at a time.

##### 25Is 90% percentile is a Good score in JEE Mains?

It is not a good percentile as 90 percentile in JEE main would mean that your score is somewhere like 100-110, just scoring above the cut off does not mean that you’d get into a good IIT or NIT. It is a fact that top 1 percentile only make it into the top IITs.

##### 26How does the NTA maintain the secrecy of the JEE exams?

The NTA has ensured strict confidentiality, integrity and fairness in the examinations. “No candidate should adopt any unfair means, or indulge in any unfair examination practices as the examination centers are under surveillance of CCTV and equipped with jammers” said NTA.

##### 27What are the marks vs. ranks for the ST and SC category in the JEE Advanced?
 Ranks Total marks for SC (/336) Total Marks for ST (/336) Air 1 301 290 Under 100 Above 165 Above 123 Under 500 Above 122 Above 85 Under 1000 Above 101 Above 68 Under 1500 Above 93 Above 59 Under 2000 Above 85 Above 54 Under 2500 Above 74 Above 50

This data is for year 2017 JEE advanced.

##### 28What will be the cut-off trend after the pattern change for the JEE 2020?

According to the previous trends of cutoffs, the expected cutoffs for JEE main 2020 :

 Common rank list 71 marks GEN-EWS 66 marks Other backward classes (OBC-NCL) 62 marks Scheduled caste (SC) 45 marks Scheduled Tribe (ST) 37 marks
##### 29Are 12th marks important for the JEE Mains?

For NITs, IIITs and CFTIs admissions, the candidates should have obtained a minimum of 75% aggregate marks or be in the top 20 percentile of their respective boards. For SC/ST category, a minimum of 65% marks required. They must have passed their class 12 examination in 2018 or 2019.

##### 30 Is the JEE Main 2020 application date extended?

The last date for submission of application for JEE Main 2020 has been extended to October 10, 2019, from September 30, 2019. The decision has been taken to give more time to candidates who have not been able to apply till now.

##### 31Is a wedge constraint a syllabus of the JEE Mains or are the questions of it asked in the JEE Mains?

Wedge and pulley systems are there for JEE Mains. Till the subject discussed by NCERT. Combined high-level problems are given for JEE Advanced.

##### 32How do I prepare for the IIT-JEE 2023?

First of all, focus on your school exams. In the eleventh class or 10th class, you can join and good coaching (SpeedLabs) and study there. It is very difficult to say about the future, the pattern may change

##### 33What are the minimum marks to be scored in the JEE Mains 2020 (which is for 300) to get into the IISC?

Category JEE Mains (Out of 360)
General 325
OBC 250
SC 220
ST 108
Accordingly, you can scale down for (Out of 300).

##### 34Is the JEE Mains 2020 physics paper going to be tougher than 2019?

It’s a very common assumption among the JEE aspirants that JEE Main and Advanced paper gets tougher with each passing year, which is not always true! Even if it gets tougher every year, it shouldn’t matter to JEE aspirants because JEE Ranks are always based on relative performance. You should never get scared of a tough JEE paper. It’s the same for all JEE aspirants. What matters is how you perform on the examination day. Those who keep their calm during the exam are the ones who perform well. One shouldn’t panic if she/he are not able to solve some questions as everything is relative. If paper is tough, it is tough for everyone and vice versa and due to this the cut-off fluctuates. All that matters is relative performance. Toughness of the paper is determined by level of your preparation. JEE has a history of surprising candidates about the difficulty level, like, “Expect the unexpected”. Whatever the questions level will be, you should be mentally prepared from your side. JEE Main 2020 can be tough or easier than 2019. As a JEE aspirant, it’s not good to worry about these things during the preparation. Don’t assume/predict the difficulty level of the JEE 2020.  Focus on concepts and practice.

##### 35How can I crack the JEE Advanced 2021 as a dropper?

you are a repeater so there is no need to panic and grieve upon the wasted time. It is about time you buckle up and start your preparation in a way that is quick, efficient and proper. Never pay heed to what others are doing, it’s very important as different people have different ways of studying and brain set. some of the things which you can keep in mind are:

• You know your strong points and weak points by this time. Work more on your weak points along with a little practice on your strong points.
• Practice previous year IIT- JEE questions many times. Become perfect in them. Solve other people’s doubts. These will help you score better.
• People run after various modules and test series. Instead, you should focus on limited material and do it more number of times .Many questions require only the knowledge of basic concepts.
• Start giving mock exams right from the beginning, and even analyse your mistakes in the paper, so that there is a negligible chance that you make silly mistakes in the next year’s JEE advanced.
• Never give up! One must stay calm and concentrated during the journey. Don't waste a single second till your exam as it is your last chance and you are using a precious year of your academic career so make sure that you make it worth.
• Do a weekly or monthly assessment of your preparation, know where you stand and how much you have improved during this year.
• Try to study at least 6–8 hours a day.
• Complete your homework daily and try to do questions in the allotted time.
• Stay with positive-minded people and be positive
• Mug up each and every formula and important points taught by teachers.

If you maintain a proper circuit for a year then, you will surely succeed in this JEE Examination. Just remember that you need to take you first step right.

##### 36How do I prepare for class 11 during 12th for the JEE (at this time of the year)?

JEE syllabus is made up of the basic concepts studied in the 11th & 12th standard. For any serious JEE aspirant, regular revision of these basics is essential as mastering a topic in class 11th does not mean that one will remember all its intricacies at the time of the JEE examination.

• Identify your weak topics and Revise: First and foremost, instead of going through all the chapters of Class 11th , identify which topics need revision and to what extent. Also, make realistic targets. Don’t put too much pressure on yourself or you’ll end up ignoring the class 12th syllabus. For JEE examination, both the class 11 and 12 syllabus carries huge weightage in the paper. Hence, revision is extremely necessary!
• Time-Management: Keep aside some time every day to revise old chapters, apart from keeping in touch with those currently being taught. Focus especially on the chapters you are weak at, and cover all three subjects, especially the ones you do not enjoy. For every five hours of study, reserve one hour for revision of old concepts. It is always better to do this revision in the morning, as it will help cement your concepts. Keep revisiting the topics you find difficult or those you do not enjoy.
• Solve previous year Papers: As the exam is approaching, you should start solving Last years’ papers to revise your concepts. Note down the problems you have difficulty with and revise the concepts used in it by reading the theory and solving basic problems.

Tips to revise Class 11 Physics:

• A good example of a topic for revision is Basic Mechanics. Revising this chapter of the JEE syllabus is a difficult task. The fundamentals learned in this chapter are used in many other, more complex topics, such as Rotational Mechanics. In order to revise these concepts, it is advisable to go through the tough problems from books such as DC Pandey and HC Verma. Avoid using books like Irodov for the revision phase as your main motive at this stage is to get a grip on the existing concepts.
• To revise the theoretical aspects of Physics, the short answer and MCQ type problems from HC Verma should be solved. Make sure you read the small hidden theoretical points that are usually ignored by students as these points feature in ‘More than one correct’ type questions in JEE. It’s also a good practice to learn the derivations of important formulae and keep revising them at regular intervals as this will further improve your understanding of the theory.
• Don’t waste time on revising topics such as vectors as these are so deeply ingrained by the time you are in class 12 that it would be a waste of time to revise the basics of vectors and calculus. Also, these chapters will be covered at a later stage (in detail) in Mathematics in the 12th standard.

Tips to revise Class 11 Chemistry:

• A useful drill for Chemistry is to write down important formulae, named reactions and their mechanisms on Post-Its and stick them to a wall. Every time you pass the wall, make it a habit of reading them once. Regularly doing this will help you remember the intricate details.
• Since most of the 11th standard chemistry is Physical Chemistry, solving problems is the key. It is especially important since physical chemistry constitute a large section of the paper. Some chapters that should be regularly revised are thermodynamics and chemical equilibrium.
• Solve subjective examples for a deeper understanding of Physical Chemistry.
• As far as Inorganic Chemistry is concerned, spend just one hour a day- 15 minutes of revision and 45 minutes of learning new things.

Tips to revise Class 11 Mathematics:

• The derivations of the various formulae should be crystal clear. You can achieve this with regular practice.
• In one hour of revision of Mathematics, spend 15 minutes learning the various derivations and the rest of the time on practicing problems. The key to learning maths is solving problems as it ensures that you won’t forget formulas. If you’re not good at remembering formulas, then you must maintain a notebook which has all the important formulas written in it. You have to prepare the notebook in such a way that you can go through it in a very short time.

##### 37How do I study chemistry without coaching for JEE Mains?

Chemistry is often the most rewarding subject in JEE Mains exam, compared to Physics and Maths which require more effort and preparation in scoring high marks. Chemistry does not require a singular focus on applications and concepts- but it requires consistent study and learning. Everyday preparation and revision of concepts can go a long way in accelerating your preparation for Chemistry.

• A useful drill for Chemistry is to write down important formulae, named reactions and their mechanisms on Post-Its and stick them to your cupboard or wall. Every time you pass the wall, make it a habit of reading them once. Regularly doing this will help you remember the intricate details.
• Physical chemistry deals with observing and understanding the physical and chemical properties of matter and our surroundings. It is one of the major portions of JEE Chemistry, covering several basic, much-used concepts and covers at least 30-40% of the JEE exam paper. Make detailed notes about each topic in Physical chemistry. Topics like Mole Concept, Thermodynamics, Energy, Chemical Equilibrium, Chemical Bonding and Atomic structure are conceptually important and require thorough understanding and learning of concepts and formulae. Also, never skip practising questions. JEE chemistry numerals can only be cracked by regular practice.
• Organic chemistry may seem difficult at first sight, since it’s not an easy task to remember the reactions, compounds, mechanisms and structures. But it’s essential to master this portion of JEE chemistry as it is highly scoring and if studied well, chances of negative marking are considerably less as the questions are generally straightforward with unambiguous answers. Also, Organic chemistry can end up as a time-saver: JEE questions in organic chemistry don’t require much work or calculations if the concepts are clear in your head, and the whole portion can be attempted quite easily in under 20 minutes. Try to understand the mechanisms instead of rote learning, and make notes for all important topics to be revised on a weekly basis.
• Inorganic Chemistry is the easiest part of JEE chemistry, as it involves almost no problem solving or calculations or formulae. It’s simple as simple can be- you either know the answer or you don’t, no need to solve or approach the question and waste time on it. Again, this makes inorganic chemistry a big time-saver, as the whole portion can be attempted within 20 minutes easily. Questions from inorganic chemistry section are mainly conceptual. Inorganic chemistry can be almost exclusively prepared from NCERT XI and XII textbooks, as the syllabus covered in it is sufficient for JEE chemistry too. Preparing this part of Chemistry well has an added advantage of covering both your Board exams and JEE as well.

Strategy for JEE chemistry

• Your main focus while preparing JEE chemistry should be to have clear concepts, application skills and concentrate on completing the syllabus before studying anything new.
• Practice more. Chemistry numerical are simple, but require loads of practice to clear any mistakes you might make. Pay attention to the details in the question.
• Patience is the key for cracking Organic Chemistry: Give sufficient time for topics like general organic chemistry, stereochemistry, etc and consistent study of these topics will yield results over time.
• Chemistry is highly scoring in every section. If you are weak in one of the parts, make sure to strengthen yourself in the other two sections- you can still obtain a high score by cracking the 2 sections.
• Always attempt theoretical questions first, and then numerical. Also, it is advisable to not attempt and numerical question in JEE papers for the first 15-20 minutes.
• Attempt at least 10-15 previous year papers before appearing for JEE. This is essential to help you get a feel of the questions asked, so you’re mentally prepared for the test.

##### 38Is it possible to get a rank under 1000 in the JEE Advanced with only 6 months of preparation? If yes, then how?

In order to get a good rank in JEE, following points must be taken care of:

• Keep Your Focus Right : You have to keep your focus fixed right till the end. Distraction of mind may prove to be the big mistake. You should have single-minded dedication towards your IIT-JEE Preparation and you will definitely achieve your goal.
• Identify the Correct Study Material : Study material plays a very vital role during the preparation. You have to make sure that what you have selected is appropriate and covers the whole syllabus. Books that are relevant and have simpler language would be of great help.
• Try to be around positive and motivated people : You have to try and stay as close as you can to those who are devoted and have a good knowledge base. Exchanging ideas and learning from each other can benefit you a lot.
• Eat and Sleep Right : You have to give in your best physical and mental efforts in order to achieve your goal and thus, maintaining a proper eating and sleeping schedule is must.
• Know the Exam pattern and syllabus : Your preparation can be in the correct direction only when you know well about the structure and pattern of the exam. It will give you a clear idea of how you need to work your way forward.
• Solve Previous Year Papers : The more you practice, the more you will move closer towards your goal. Try and solve the previous IIT-JEE question papers and analyse your performance.
• Revise Thoroughly : You have to take out time for revision as it is one of the most effective ways of learning. Revise as much as you can. Since, you don’t have much time left for your examination, try and focus on the topics in which you are confident.

REVISION AND PRACTICE IS THE KEY TO SUCCESS DURING THE LAST FEW MONTHS.

##### 39What was your score in the JEE 2019 for getting a 96 percentile?

Details of JEE Main Marks vs Percentile

 JEE Main Marks Percentile 360 to 310 100 - 99.98724751 309 to 299 99.985572 - 99.9740296 298 to 288 99.97589128 - 99.96258028 287 to 278 99.96146328 - 99.94424276 277 to 268 99.94098483 - 99.91929629 267 to 258 99.91836545 - 99.89081262 257 to 248 99.88643768 - 99.84845946 247 to 238 99.84510844 - 99.79959043 237 to 228 99.79679791 - 99.73294238 227 to 218 99.73005678 - 99.65475193 217 to 208 99.64888765 - 99.55273201 207 to 198 99.54919482 - 99.43609792 197 to 188 99.4200875 - 99.28958392 187 to 178 99.26473052 - 99.07781811 177 to 168 99.06329703 - 98.85683701 167 to 158 98.82509541 - 98.55710695 157 to 148 98.53104347 - 98.20040957 147 to 138 98.14939961 - 97.75686494 137 to 128 97.69477799 - 97.17648701 127 to 118 97.13841571 - 96.41990133 117 to 108 96.35511496 - 95.49744019 107 to 98 95.42678954 - 94.40128456 97 to 88 94.19473145 - 92.74709113 87 to 78 92.61891464 - 90.64227869 77 to 68 90.42902355 - 87.34180397 67 to 58 87.34180397 - 82.68016383 57 to 48 81.92571907 - 75.39020758 47 to 38 74.13450619 - 64.11300382 37 to 28 62.88839244 - 49.28762915 27 to 18 49.01228707 - 33.08815042 17 to 1 31.32570046 - 9.077538863
##### 40What should be my last 3 months strategy for the JEE Mains 2020?

If you want to succeed at this first step, you need to understand the right direction. Starting preparation without correct knowledge is severe wastage of time.

First and foremost is Understanding the exam pattern which is given below:

• 3 Hours’ Time Duration to Solve the Objective Type Questions from Physics, Mathematics & Chemistry.

• 4 marks are awarded for each correct answer and 1 mark is deducted for each wrong attempt.

• The exam is conducted in online mode

The second step would be knowing the Topic-wise weightage.

JEE Main Exam covers 40 % of the syllabus from 11th standard and 60 % syllabus from the 12th standard approximately. The topic wise weightage of each subject for JEE Main is given below.

 S.No. Chemistry Physics Mathematics Topics Weightage Topics Weightage Topics Weightage 1. Organic Chemistry 34% Mechanics 25% Differential Calculus 15.20% 2. Inorganic Chemistry 30% Electro Dynamics 22.58% Probability 7.26% 3. Physical Chemistry 36% Heat & Thermodynamics 12.90% Integral Calculus 16.94% 4. - - Modern Physics 18.55% Matrix Determinants 11.29% 5. - - Optics 14.52% Coordinate Geometry 14.52% 6. - - SHM & Waves 6.45% Trigonometry 8.06%

Step 3: MAKE A WEEK-WISE STUDY PLAN

Time to Get in Action! You have gone through the above tasks. Now, before we lay out the JEE Mains 3 Months Study Plan for you, it’s very important to make a daily schedule. It is impossible to crack JEE Mains while you are not aware of your daily schedule.

#### 1st Month Study Plan!

 Weeks Subjects Topics 1 st Week Physics Units & Dimension Chemistry Solid States & Atomic Structure Mathematics Binomial Theorem 2 nd week Physics Current Electricity Chemistry Solution and Colligative Properties Mathematics Differential Calculus 3 rd Week Physics Electro-Magnetism Chemistry Electrochemistry & Chemical Kinetics Mathematics Coordinate Geometry 4 th Week Physics Work Energy power & Gravitation Chemistry S & P block Mathematics Matrix & Determinants

#### JEE Mains 2020 Study Plan for 2nd Month

 Weeks Subjects Topics 1 st Week Physics Geometrical Optics & Wave Optics Chemistry Chemical Bonding’s & Basic Principles of Organic Chemistry Mathematics Integral Calculus 2 nd week Physics Heat Transfer Chemistry D & F block Mathematics Integral Calculus 3 rd Week Physics Atoms & Nuclei Chemistry Alcohol, Phenol &Ether Mathematics Quadratic Equation 4 th Week Physics Properties of matter and fluid Chemistry Stereo Isomerism & Biomolecules Mathematics Permutation & Combination
 Weeks Subjects Topics 1 st Week Physics Kinematics Chemistry Chemistry in Everyday life & Polymers Mathematics Trigonometry 2 nd week Physics Wave Optics Chemistry Hydro Carbons & Organic Compounds Containing Nitrogen Mathematics Sequence & Series 3 rd Week Physics SHM & Sound Waves Chemistry Hydrogen & Purification of Organic Chemistry Mathematics Vector & 3D 4 th Week Physics Modern Physics Chemistry General Process of Isolation of Metals Mathematics Probability

AVOID DISTRACTIONS

Preparation for JEE Exams is demanding! Keep all the disturbing elements like mobile phones and gaming console etc. at an arm’s length.

Stay away from social networking sites for a few months. But keep yourself updated with Latest News & Notification regarding JEE Mains & Advanced 2020 Exam.

REVISION

You must have heard that Revision is more important than cramming the night before the exam & it’s true.

Make small notes, mark the important questions, practice diagrams, and learn formulas and their applications. Preparing self-notes is the subtle yet powerful way of revision to memorize everything you have gone through.

PRACTICE

Give JEE Mock Tests regularly and keep evaluating your performance at each stage. Chalk out the plan to overcome the weak areas and make strong points stronger.

##### 41Is the SPD and F block important in the JEE Mains 2020 point of view?

YES, keeping JEE in mind these topics are very important. Specially p-block and d- block these two units are most important. Given below is the complete syllabus of these chapters, so you can take reference which topics you have to cover.

II. Compounds of s-block elements

• Preparation and properties of some important compounds - sodium carbonate, sodium chloride, sodium hydroxide and sodium hydrogen carbonate

• Industrial uses of lime, limestone, Plaster of Paris and cement

• Biological significance of Na, K, Mg and Ca.

UNIT 15: p - Block Elements

Group 13 to Group 18 Elements

• General Introduction: Electronic configuration and general trends in physical and chemical properties of elements across the periods and down the groups; unique behavior of the first element in each group.

• Groupwise study of the p–block elements

Group - 13

Preparation, properties and uses of boron and aluminium; Structure, properties and uses of borax, boric acid, diborane, boron trifluoride, aluminium chloride and alums.

Group - 14

Tendency for catenation; Structure, properties and uses of allotropes and oxides of carbon, silicon tetrachloride, silicates, zeolites and silicones.

Group - 15

Properties and uses of nitrogen and phosphorus; Allotrophic forms of phosphorus; Preparation, properties, structure and uses of ammonia, nitric acid, phosphine and phosphorus halides, (PCl3, PCl5); Structures of oxides and oxoacids of nitrogen and phosphorus.

Group - 16

Preparation, properties, structures and uses of dioxygen and ozone; Allotropic forms of sulphur; Preparation, properties, structures and uses of sulphur dioxide, sulphuric acid (including its industrial preparation); Structures of oxoacids of sulphur.

Group - 17

Preparation, properties and uses of chlorine and hydrochloric acid; Trends in the acidic nature of hydrogen halides; Structures of Interhalogen compounds and oxides and oxoacids of halogens.

Group - 18

Occurrence and uses of noble gases; Structures of fluorides and oxides of xenon.

UNIT 16: d– and f– Block Elements

Transition Elements

Inner Transition Elements

General introduction, electronic configuration, occurrence and characteristics, general trends in properties of the first row transition elements - physical properties, ionization enthalpy, oxidation states, atomic radii, colour, catalytic behaviour, magnetic properties, complex formation, interstitial compounds, alloy formation; Preparation, properties and uses of K2Cr2O7 and KMnO4.

• Lanthanoids - Electronic configuration, oxidation states, chemical reactivity and lanthanoid contraction.

• Actinoids - Electronic configuration and oxidation states.

##### 42Will it be a good idea to drop for the JEE 2021 if I have not prepared specifically for it in class 11-12?

Well to be honest it depends on how badly you want to crack JEE.

##### 43If a person fails in the JEE which will be in January, will he still be eligible to take the JEE in April according to the new pattern?

YES, that’s why only NTA started to conduct exam twice a year so that a student doesn’t have to wait one full year if he gets fail in the exam.
If a student gets fail in January attempt, he can surely sit in the April attempt.

##### 44I don't want to sit for the JEE Main January session 2020. Can I sit for the JEE Main April Session 2020 alone?

Yes for sure you can give exam directly in the April Session. It is not necessary to give January attempt to appear for April attempt.
Also, if after January exam you don’t want to give April exam then also it is fine. NTA will take your best score out of the two exams so if you will you just want to appear once then it perfectly ok.

##### 45Which is the best test series for the JEE Mains/Advanced 2020, considering the change in pattern?

Now this question is very important for your preparation point of view. As NTA just announced change in pattern of JEE Mains (Which is 20 Objective and 5 Numeric type questions in each subject) it is very difficult to find test series based on exactly this pattern. SPEEDLABS(An AI based Learning and Practice Platform) is an EdTech company which is providing not only full syllabus but also part test based on this pattern.

##### 46How do we come to know if the image uploaded in the JEE Mains 2020 form has some discrepancy in it?
1. Following are the Photograph and Signature specifications for JEE 2020 form

 Specification Photograph Signature Format JPEG or JPG JPEG or JPG Size 10 kb – 200 kb 4 kb – 30 kb Color Black/ or colored (both allowed) Other Specifications Should be of good contrast

The reasons for the photo discrepancy are:

1. The Photo may be burred

2. The image might not be as per specifications

3. The background is not acceptable

4. The specs worn by the candidate may have shown a red eye

5. Signature is not clear

6. Signature is in capitals

7. Image of signature is not as per specifications

You can remove discrepancy in JEE Main 2020 application form by following the steps given below. These are simple, easy to do steps. However, if you want, you can ask your parents or teachers to assist you.

Step 1. Go to jeemain.nta.nic.in. Please note that this is the new official website of the Joint Entrance Examination (JEE) Main.

Step 2. Click on the link “remove image discrepancy”, which you can see under current events. If you cannot see it then that means that image discrepancy removal facility is not available at that time.

##### 47Was the JEE-Mains of April session tougher than that of January session?

There would be easy as well as difficult questions in the January's and April's JEE Main papers. It is possible that difficult questions would be from different chapters in both of the JEE Main Paper. NTA will maintain a standard and prepare the question papers.

##### 48Which 3 tips do you recommend to students preparing for the JEE Advanced?

• Try to learn from your mistakes: Analyse the Practice paper (mock test or previous year) after writing the paper. Keep a track record of all your practice papers, revise the topics that may act as your weak links. Do the deep analysis of your paper. Check the right answers and wrong answer separately, find your mistakes in the paper. Try to look at the solved papers and try to think where you went wrong.
• Make chapter wise notes (only important things like formulae and key concepts) so that you can revise the concepts without wasting time. It’s better if you refer some of the online material or booklets provided by some of the ed-tech portals. (one of many portals available is speedlabs.in)
• JEE is structured not only to test your knowledge and concept prowess, but also the mental toughness, be prepared to get surprised a couple of times during the paper, bet keep calm composure towards everything, believe in your preparation. Solve one question at a time.

##### 49Is 90% percentile is a Good score in JEE Mains April 2019?

It is not a good percentile as 90 percentile in JEE main would mean that your score is somewhere like 100-110, just scoring above the cut off does not mean that you’d get into a good IIT or NIT. It is a fact that top 1 percentile only make it into the top IITs.

##### 50How does the NTA maintain the secrecy of the JEE exams?

The NTA has ensured strict confidentiality, integrity and fairness in the examinations. “No candidate should adopt any unfair means, or indulge in any unfair examination practices as the examination centers are under surveillance of CCTV and equipped with jammers” said NTA.

##### 51What are the marks vs. ranks for the ST and SC category in the JEE Advanced?
 Ranks Total marks for SC (/336) Total Marks for ST (/336) Air 1 301 290 Under 100 Above 165 Above 123 Under 500 Above 122 Above 85 Under 1000 Above 101 Above 68 Under 1500 Above 93 Above 59 Under 2000 Above 85 Above 54 Under 2500 Above 74 Above 50

This data is for year 2017 JEE advanced.

##### 52What will be the cut-off trend after the pattern change for the JEE 2020?
1. According to the previous trends of cutoffs, the expected cutoffs for JEE main 2020 :

 Common rank list 71 marks GEN-EWS 66 marks Other backward classes (OBC-NCL) 62 marks Scheduled caste (SC) 45 marks Scheduled Tribe (ST) 37 marks
##### 53What should be the strategy to be followed for ML Khanna’s mathematics for the JEE Mains 2020?

Consider this book as a reference for your maths, and solve questions simultaneously from any other book or for best practice use speedlabs practice platform. This book is good for theory and understanding the concept

##### 54Does the JEE 2020 accept the NIOS mark sheet?

Yes, JEE Mains 2020 accept NIOS mark sheet

##### 55What is the impact on the merit list of the JEE Mains after the pattern change?

The advantage of new system is no negative for wrong answers. There will be a disadvantage if the integer answer can be decimal

##### 56Will 140-160 marks in the JEE Main 2020 be enough to get into a good NIT or IIIT?

No, to get into a good NIT, you should score around 200 – 220, more the score than this better chances of getting your desired branch in a better NIT

##### 57What are some must-do questions for vectors and 3D regarding the JEE Mains and Advanced?

Important topics under these 2 units are Scalar Triple Product, Vector Triple Products, questions based on Plane and lines

##### 58Are 12th marks important for the JEE Mains?

Yes, after getting ALL INDIA RANK (AIR), 12th class marks are also very much important candidate should have secured at least 75% marks in the 12thclass examination, or be in the top 20 percentile in the 12th class / Qualifying examination conducted by the respective Boards.

##### 59Should I skip the JEE Mains studies and directly finish the JEE Advanced if I'm preparing for the Advanced (solo)?

Well for clearing JEE advanced you have to give JEE Mains and also you need to clear it then only you can appear for JEE Advanced.
Now, if you are thinking that you don’t need to score high in mains as your target is advanced then I think you are making a mistake.
Because no matter how good is your preparation is you can’t be 100 percent sure that you are going to kill in exam because there is always some factors which are not in your hand. And if by any reason you didn’t get select in advance then a good Mains Score can get you in NIT, IIITs and good Govt. colleges. Also, you don’t have to prepare anything different for mains syllabus of both the exams is same.
So I suggest prepare in the best way possible for both the exams. Also a good JEE mains score can boost your confidence for JEE Advanced.

##### 60Is there any need to study mechanics or electrostatics if I am covering the JEE Mains?

Absolutely Yes, you can’t expect good marks in physics section if you skip this two important units. Mechanics contribute roughly 35% of the marks and from electrostatics also there will be 1-2 questions. Mechanics is a full unit it contains around 7-8 chapters and also this unit is very scoring. Questions from LNM and Work, power and Energy are relatively easy so you can easily score from this section.

##### 61How much should one score to get above the 99.9 percentile in the JEE Mains January 2020?

As per the new pattern, JEE mains will be of 300 Marks this year. By analyzing JEE mains 2019 marks vs Percentile table (given below) we can get a rough idea of how much marks are required for getting 99.9 percentile.

We can see on scoring 260+ Marks students got 99.9 above percentile score. On calculating roughly 70% above marks are needed. Normalizing it with this year pattern(as JEE Mains was of 360 marks in 2019) 210-220 marks will be required in Mains 2020 for getting 99.9 percentile. Again this is a rough idea because this year numerical type questions are also introduced, so the stats can change accordingly but it will be in this range.

So, if you want 99.9 percentile in JEE Mains 2020 keep the target of scoring above 210.

##### 62If I get 220 marks in JEE Mains 2020 what will be my general rank?

First of all if you think you can score 220 marks then congratulations you are in a good position.

Now talking about rank in general category, keeping in mind the rank vs marks trend of JEE Mains 2019(given below)

Form this table you can see candidates scoring above 250 marks got ranks under 1500.

250 is roughly 70% of 360(Total marks in JEE mains 2019). But his year Paper will be of 300 Marks and if you are expecting 220 then it is also around (70% – 75%). So you can expect rank under 1500. But this analysis is based on last year trend it can change this year because NTA has changed the pattern.

##### 63What books should I follow and prepare for the JEE 2020 if i am in class 12th ?

While creating the preparation strategy for JEE Main, one of the most, it is important to have a good knowledge of the right set of reference books., we are providing a list of some of the best books one can refer to while preparing for JEE Main 2020 exam.

Let us discuss subject wise

1. Physics - Physics has both theoretical questions and practical problems. Since questions are mostly concept based and direct questions rarely come in this section, the books that . The books that will help you in studying, revising and practising the JEE Main physics syllabus are listed as follows

1. NCERT

2. H.C Verma

3. D.C Pandey

1. Chemistry - Most students feel that chemistry is the easiest section of JEE Main exam because of less formulae, calculations involved etc. However, it is a subject that mostly revolves around theories and concepts. For chemistry, consider NCERT as the bible and plan your study plan around it only.

Some other books which you can follow

1. Himanshu Pandey for Organic Chemistry

2. M.S. Chouhan for Organic Chemistry

3. N. K Awasthi for Physical Chemistry

4. V. K Jaiswal for Inorganic Chemistry

1. Maths - Mathematics is generally considered the toughest of all subjects and includes comprehensive problems on prescribed topics. Its preparation requires a lot of practice of relevant questions and deep understanding of concepts. Maths though is very scoring and if prepared well, you can score full marks, ultimately fetching you a good rank. The reference books for practising the problems of JEE Main mathematics are given here –

1. Objective R.D Sharma

2. Also you can Solve Arihant Series.

3. Objective Questions only from Cengage.

##### 64Is HCV sufficient for the JEE Mains?

Conceptually HCV is sufficient for mains, as the concepts are thoroughly explained in it. For  practice you might need some other source (DC PANDEY) which has a good number of mcq & integer type question.

##### 65What should be my strategy in the last two months for the JEE Main January exam?

Mains exam is highly dependent on formula based question, as most questions are directly formula application. For chemistry revision of notes is very important as more you revise, the faster you can recall. For physics & mathematics revise all the formula and practice more number of questions. The best strategy should be attempt all past 10-15 years past papers of JEE mains.

##### 66How many concepts per day do I need to complete to crack the IIT-JEE Main and Advanced?

There exists no such formula rule given the vast diversity within subjects (physics, Chem & maths) & also learning calibre of each individual candidate is different. Ideally your syllabus should be completed at least 4 months prior first mains exam so that you have sufficient time for revision and solving past year papers.

##### 67How is the book Cengage Chemistry JEE Main by K.S. Saini Seema Saini?

It is a good book for mains, the exercises contain sufficient number of questions includes all pattern of questions & level of question is also good.

##### 68What is good for me right now, to cover thermodynamics of physics and chemistry or to go for the JEE Main 2020 (January) without thermodynamics?

Thermodynamics is important subject as you will surely get a question based on it. Sometimes they ask thermo questions in both physics as well as chemistry section so it will be dual loss. In mains even a single marks counts a lot, so it is highly recommended to prepare these chapters given you have sufficient time before exam

##### 69Does leaving chemical kinetics for the JEE Mains affect your marks?

Completely leaving some topic does not make sense, because even 4-8-marks difference can fluctuate your rank greatly.

##### 70Does constraint motion come in the JEE Mains?

As per the past records, the no. of questions asked from this particular topic are very less. So, the chances of getting a direct question of Constraint motion are rare. However, the concept of constraint motion can be asked indirectly in the questions of some other important topics (e.g. Rotation).Also, this topic is very easy compared to the other topics of physics. So, get command over the topic by revising the concepts involved and practicing the questions.
There have been instances where JEE asked questions on topics which has never been asked before. So, it is advised to clarify your doubts as early as possible.

##### 71Does IIST Thiruvananthapuram accept the JEE Main score or the JEE Advanced score?

Indian Institute of Space Science and Technology declares IIST B. Tech cut-off for admission in the courses. Candidate who will not have JEE Advanced score equivalent to IIST B. Tech cut-off will have less chances of admission in comparison to those who have score more than or equivalent to the cut-off. The authorities will prepare IIST B. Tech cut-off 2019 on the basis of certain influential factors because of which it will vary for each B. Tech programme and category. It is important to know that IIST B. Tech cut-off will form the basis of admission as candidates will be invited to participate in the counselling procedure on their ranks meeting the cut-off.

##### 72How can I master inorganic chemistry for the JEE Main in 7 months of time?
• Inorganic chemistry is one of the most scoring sections in JEE provided you get your preparation right.

• It is very easy if your preparation is right, and also less time consuming when it comes to solving the questions and most of the questions asked are a direct pick from NCERT

• Study NCERT in depth.

• Be clear with theconcepts of bonding and coordination chemistry and learn block chemistry and its reactions from NCERT . This is sufficient for both JEE mains and JEE advanced.

• For JEE advanced one extra topic is included in advanced syllabus by name of analytical chemistry i.e. (Salt analysis) for this you need to study from some reference books like J.D. Lee.

• At last solve all the previous year questions of JEE main and JEE advanced ( subjective questions too) to get the clear idea that what types of questions are framed in JEE exams.

• One of the most important things is DAILY REVISION!

##### 73Is it possible to crack the JEE Mains 2020 with a good rank if we are focusing mainly on the class 12th boards?
• Given the vast syllabus of JEE, a few Weeks’s time is not nearly enough for proper revision of topics even. We keep hearing from parents and teachers “Board exams are really important, study well “and also get the advice “you need extra preparation to get good rank in JEE “

Now obviously keeping up with JEE while preparing for boards is not going to be easy-It will require effort, meticulous planning and execution BUT ITS POSSIBLE!

• Have a plan: Include the entire JEE MAIN + BOARD SYLLABUS while making the plan, it will help you see the entire syllabus at one place and organize them into manageable pieces.

• Focus on theory and concepts: While board exams focus on theory, JEE MAIN is more about practice and application of concepts

• Analyze the pattern

• Thorough, regular revision and practice

There are online platforms like SPPEDLABS where their experts have delved into this issue and have come up with detailed instructions and guidance to help you excel in boards and JEE simultaneously.

##### 74How do I prepare for maths for the JEE 2020?

Mathematics is a subject which requires a lot of practice. The concepts and the formulae should be at your fingertips. You must know every shortcut possible in order to get an edge over other students. Mathematics is not just solving but requires visualisation skill too (ex.- graphs and curve sketching).

1. Work on theory: Understand the basic theory of each chapter. While solving a question you must be able to answer the following questions:

• What are we calculating?

• Why are we doing so?

• What is its significance?

• Where is it applied?

Once we have done this, we are on our way to the second step.

1. Observe your Teacher: Whenever a problem is being solved, just keep the pen down and observe “what’s happening?”, “what’s the magic that I lack?”, “what’s the basic idea?”, “what’s the algorithm?”. While doing this make a mind-map of the process to be followed while doing the same problem. This will improve your efficiency as you will learn different shortcuts and tricks to solve the problem.

2. Practice: Practice makes a human perfect. So, once you know what to do, the most important bit is to do it yourself and analyse the part you are having difficulty with. Ask your doubts to someone you believe can solve as well as explain you the way to do it. It will take time but eventually you will succeed.

##### 75What is the weightage of the JEE Mains 2020?

The new pattern and weightage of each chapter subject-wise is given below:

JEE Main 2020 Exam Pattern

 Parameters Particulars Exam Mode Computer-based test (CBT) Exam Duration 3 hours Subjects Physics, Chemistry, and Mathematics Total number of questions 75 (Each subject will have 25 questions) Sections 3 (Physics, Chemistry and Mathematics Type of Questions Each section will have 20 Objective questions having 4 options each with only 1 correct option and 5 Numerical questions with numerical value as answer Marking Scheme For MCQs - 4 Marks will be awarded for every correct answer and 1 Mark will be deducted for every incorrect answer For answer with numeric value - 4 Marks will be awarded for every correct answer and 0 Mark will be deducted for every incorrect answer Maximum Marks 300 Medium of paper English or Hindi (Candidates from Gujarat, Daman & Diu and Dadra and Nagar Haveli can opt for Gujarati as well)

Topic/Chapter wise JEE Main Syllabus with Weightage for Physics is given below:

 Topics No of Questions Marks Modern Physics 5 20 Heat and Thermodynamics 3 12 Optics 3 12 Current Electricity 3 12 Electrostatics 3 12 Magnetics 2 8 Unit, Dimension and Vector 1 4 Kinematics 1 4 Laws of motion 1 4 Work, Power and Energy 1 4 Centre of Mass, Impulse and Momentum 1 4 Rotation 1 4 Gravitation 1 4 Simple Harmonic Motion 1 4 Solids and Fluids 1 4 Waves 1 4 Electromagnetics Induction; AC 1 4

# Topic/Chapter wise JEE Main Syllabus with Weightage for Mathematics for Previous Year

 Topics No of Questions Marks Coordinate Geometry 5 20 Limits, Continuity and Differentiability 3 12 Integral Calculus 3 12 Complex numbers and Quadratic Equation 2 8 Matrices and Determinants 2 8 Statistics and Probability 2 8 Three-Dimensional Geometry 2 8 Vector Algebra 2 8 Sets, Relation and Function 1 4 Permutations and Combinations 1 4 Binomial Theorem and Its Application 1 4 Sequences and Series 1 4 Trigonometry 1 4 Mathematical Reasoning 1 4 Differential Equation 1 4 Statics and Dynamics 1 4 Differential Calculus 1 4

### Topic/Chapter wise JEE Main Syllabus with Weightage for Chemistry for Previous Year

 Topics No of Questions Marks Transition Elements and Coordination Chemistry 3 12 Periodic table and Representative Elements 3 12 Thermodynamics And Gaseous State 2 8 Atomic Structure 2 8 Chemical Bonding 2 8 Chemical And Ionic Equilibrium 2 8 Solid State And Surface Chemistry 2 8 Nuclear Chemistry And Environment 2 8 Mole Concept 1 4 Redox Reaction 1 4 Electrochemistry 1 4 Chemical Kinetics 1 4 Solution and Colligative Properties 1 4 General Organic Chemistry 1 4 Stereochemistry 1 4 Hydrocarbon 1 4 Alkyl Halides 1 4 Carboxylic Acid and their Derivatives 1 4 Carbohydrates,amino acid and Polymers 1 4 Aromatic Compounds 1 4
##### 76Does leaving chemical kinetics for the JEE Mains affect your marks?

As per the past records, the no. of questions asked from this particular topic are very less. So, the chances of getting a direct question from chemical kinetics are rare. If you leave this topic, your marks won’t be affected much. But, this topic is very easy compared to the other topics of Physical Chemistry. So, getting command over this topic won’t be a herculean task.

Weightage of each chapter of chemistry given below will help you in knowing the importance of various topics:

 Topics No of Questions Marks Transition Elements and Coordination Chemistry 3 12 Periodic table and Representative Elements 3 12 Thermodynamics And Gaseous State 2 8 Atomic Structure 2 8 Chemical Bonding 2 8 Chemical And Ionic Equilibrium 2 8 Solid State And Surface Chemistry 2 8 Nuclear Chemistry And Environment 2 8 Mole Concept 1 4 Redox Reaction 1 4 Electrochemistry 1 4 Chemical Kinetics 1 4 Solution and Colligative Properties 1 4 General Organic Chemistry 1 4 Stereochemistry 1 4 Hydrocarbon 1 4 Alkyl Halides 1 4 Carboxylic Acid and their Derivatives 1 4 Carbohydrates,amino acid and Polymers 1 4 Aromatic Compounds 1 4