Hello dear aspirant.

As you will be well aware of the fact that there are certain rules and pattern of JEE mains examination changed this year. So as of now the best books which you can easily understand and are very helpful in JEE mains exam are NCERT books . In addition to this solve previous years question papers and join any test series to evaluate yourself.

You will surely have better results.

Good luck

Hey there

For JEE mains you should strictly follow NCERT. There are good reference books also like for physics HC Verma, for maths rd Sharma, chemistry op Tandon etc.

Check the link for list of books for jee mains

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/best-books-for-jee-main/amp&ved=2ahUKEwiiiLHI4KflAhXX7HMBHa-1BR8QFjAEegQIERAK&usg=AOvVaw1wil8ti_ze9MSV-Wo_mLsd&ampcf=1

Good luck