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

CHEMISTRY-

NCERT Chemistry textbooks for Class XI and XII  

Physical Chemistry by OP Tandon  

ABC of Chemistry for Classes 11 and 12 by Modern

 Concise Inorganic Chemistry by JD Lee

 Dinesh Chemistry Guide  

Practise books by VK Jaiswal (Inorganic), MS Chauhan (Organic) and N Awasthi (Physical)

PHYSICS- 

 NCERT Physics Class XI & Class XII  

Concepts of Physics by H. C. Verma

 Objective Physics By DC Pandey

 Fundamentals of Physics by Halliday, Resnick and Walker

 Fundamental Physics by Pradeep

 Problems in General Physics by IE Irodov