Dear Priyam,

NCERT are the best books to prepare as they help you to clear your concepts and to build your fundamentals strong. 

Apart, from NCERT you can refer to below recommended books

Biology

Objective Biology by Dinesh
Pradeep Publication's Biology

Chemistry

OP Tandon

Make sure you also solve previous year questions to know the level of the exam and MCQs for your practice.

Focus on the topics which carries more weightage in the exam.

Good Luck!!