Hi

NCERT is good for JEE MAINS , especially for starting your preparation for JEE mains as it is very good book for clearing basic concepts ,inorganic part of the NCERT is very important and somewhat sufficient for JEE mains but when it comes to organic and physical chemistry then it is not sufficient you will have to take the help of reference books for better understanding of concepts so that you can solve MCQs or the questions asked in JEE Mains examination.

You can follow below books:-

CHEMISTRY:-

Ncert Chemistry for class XI and XII
Physical Chemistry by OP Tondon
Numerical Chemistry by P.Bahadur
Organic chemistry by OP Tondon

For more information , go through

https://engineering.careers360.com/articles/best-books-for-jee-main/amp

Thankyou