Hello

Best book for biology is NCERT .
actually ncert is very concentrated , so please focus more only and only on NCERT biology for best results

Hello
The best books to prepare for neet examination for biology is mainly NCERT . Keep a strong hold on your NCERT textbook as majority of the questions comes from it.
You can also refer trueman biology, Akash or Allen package but don't get through too many books as they would confuse you.
Goodluck I hope this helps you