The most important chapters, which are low input and high output are:

1. Environmental Chemistry

2. Hydrocarbons (class 11th)

3. Periodic Table chapter (class 11th)

These chapters should be studied thoroughly from the NCERT and can easily fetch you 4-12 marks in the exam.

Other chapters which you need to focus on are:

1. Coordination compounds

2.p-block

3. Equilibrium

4. Aldehydes & Ketones.

Minimum 4-5 questions are asked from these topics and these should completed thoroughly.

Another important thing is to complete the previous 20 years question papers of JEE Main and Advanced, as they would open you to some of the most important type of question. Sometimes, questions are repeated from the previous years, without any change. Also, analyse your weaker areas while solving these papers. See where you lag and move ahead accordingly.

All the best!

Hello dear student,

As you have asked for the most important chapters so for that I am here sharing you a link where you can check for the important chapters according to their weightage and that will help you to figure out which chapter is important and on which chapter you should concentrate more. why you have also ask how to strengthen you chemistry for JEE mains so dear student at this point of time the only way out to get good marks in chemistry is you better be start solving previous year question papers that have come in exams and also to solve MCQ as many as you can after each chapter or topic you solve or do.. and I hope this will be helpful for you thank you.