Which book is good for the preparation of main and advance
Hello,
I would suggest that you should NCERT books arae the best for JEE Main preparation. Apart from NCERT, you should also refer to other books. Refer to the link below to check the list of important books. For JEE Main preparation-
https://engineering.careers360.com/articles/jee-main-2019
For JEE Advanced-
https://engineering.careers360.com/articles/jee-advanced-2019