NCERT Textbooks of Class 11 and 12 Are best for Basic preparation and concept clarification. Once done with this books, you can move on to the other books.
Best books for Comedk-

Physics-
Concepts of Physics by H. C. Verma - one of the best books for Physics.

Objective Physics By DC Pandey

Chemistry-
Physical Chemistry by OP Tandon

ABC of Chemistry for Classes 11 and 12 by Modern

Concise Inorganic Chemistry by JD Lee

Maths- Objective Mathematics by R D Sharma

Mathematics Book COMEDK by M. R. Hanumantharaya, H. S. Mahadevaiah