Hi, National Testing Agency is the conducting body for NEET exam. NEET syllabus for Biology is based on the NCERT syllabus of class 11 and 12. So, you have to be thorough with the NCERT books first along with the NCERT syllabus and then use other books for reference. Syllabus of NEET has been decided after review of various State syllabi as well as those prepared by CBSE, NCERT, and COBSE. The question pattern in NEET is of multiple choice questions. Some of the best books for NEET are Biology Vol 1 and Vol 2 by Trueman, Objective Biology by Dinesh, Pradeep Guide on Biology, Objective NCERT at your Fingertips - Biology by MTG Editorial Board, GR Bathla publications for Biology etc.

Hey 

Here is a list of the best sources of books and publishers that you can use for preparing for NEET for each subject.

BIOLOGY-

NCERT Biology Class XI and Class XII textbooks

 Biology Vol 1 and Vol 2 by Trueman

 Objective Biology by Dinesh  

Objective Botany by Ansari  

Pradeep Guide on Biology  

GR Bathla publications for Biology