Hello,

You should primarily focus on NCERT textbooks of class 11 and 12. You must clear your concepts and have proper understanding of every topic. Other helpful books include-

Books for Physics- 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

For Chemistry- 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)

Books for Biology-

Biology Vol 1 and Vol 2 by Trueman

Objective Biology by Dinesh

Objective Botany by Ansari

Pradeep Guide on Biology

GRB Bathla publications for Biology

Hope this helps.

Good Luck!