If you are preparing for medical exam make sure your basics are clear. To clear your concepts and to build strong fundamentals you can refer NCERT books. It should be your first priority. 

Below are the recommended books which you can refer after NCERT

Best Biology Books for AIPMT/NEET Preparation:

NCERT Biology of Class XI and XII

Trueman's Biology Vol 1 and 2

Objective Biology by Dinesh

Pradeep Publication's Biology

GRB Bathla's Publication's for Biology

Best Physics Books for AIPMT/NEET Preparation:

Concepts of Physics by H. C. Verma

NCERT- Physics Part 1 and Part 2

D C Pandey Objective Physics

Fundamentals of Physics by Halliday, Resnick and Walker

Problems in General Physics by I. E. Irodov

Best Chemistry Books for AIPMT/NEET Preparation:

NCERT Chemistry

Physical Chemistry by O.P. Tandon

Organic Chemistry by Morrison and Boyd for Organic Chemistry

Modern’s ABC of Chemistry for class 11th and 12th

Concise Inorganic Chemistry by J. D. Lee for Inorganic Chemistry

Dinesh Chemistry

Good Luck!!