To crack NEET and AIIMS make sure your first preference should be to complete your NCERT book. It will help you to clear your concepts and to build your fundamentals strong. Syllabus is based on your NCERT book only. 

After completing NCERT book you can go through below recommended books

Best Chemistry Books 

Modern ABC of Chemistry for Class 11th & 12th (Vol. 1 & 2)

Physical Chemistry by O P Tandon

Arihant Organic Chemistry

Dinesh Chemistry

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

Objective NCERT at your fingertips Chemistry by MTG

Best Physics Books

H C Verma for Physics

Aggarwals’ Concept of Competition Physics for CBSE PMT

NCERT Physics: CBSE PMT by Anil Aggarwal (Set of 3 Volumes)

Objective Physics for Medical Entrances Examination (Volume 1 and Volume 2)