Dear Jayesh,

In order to prepare for your exam NCERT books are very important to score good marks in your exam.

NCERT books will help you to clear all your concepts and to build your fundamentals strong. 

Exercises which are given at the end of completing each chapter are very important as you can get direct questions from there specially in biology. 

You can also solve NCERT exemplar.

In short period of time it is very important that you focus on the topics which carries more weightage in the exam. Refer pevious year papers and solve as many as mock test series for your practice.

Good Luck!!