Hello

NCERTs are the best books for preparation of JEE Mains exam. You must be thorough with the concepts of NCERTs. You should also refer to other important books for in-depth knowledge. If you are appearing for JEE Main January exam, only a few days are left for the exam so try to solve previous year question papers and mock tests and focus on revision. You can go through the link below and check the important topics for JEE Main exam-

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https://engineering.careers360.com/articles/jee-main-important-topics-books

Good luck!

Hii Ram Chandra..NCERT is the major referral book for the JEE mains as well as JEE advance. JEE mains exclusively covers entire chapters of the NCERT.

So especially do JEE mains all the chapters of NCERT must be covered. For Jee advance you need to exclude and add few topics.

Hope this helps you. All the best.