NCERT is the best book for NEET preparation so firstly go through well with NCERT books. Here is a list of books to refer for NEET Medical entrance exam :

Best Biology Books for NEET Preparation:

NCERT Biology of Class XI and XII
Trueman's Biology Vol 1 and 2
Objective Biology by Dinesh

Best Physics Books for NEET Preparation:

Concepts of Physics by H. C. Verma
NCERT- Physics Part 1 and Part 2
D C Pandey Objective Physics

Best Chemistry Books for NEET Preparation:

NCERT Chemistry
Physical Chemistry by O.P. Tandon
Organic Chemistry by Morrison and Boyd for Organic Chemistry

Good Luck!