NCERT books will help you to make the basic fundamental strong but to score good in the exam you need to prefer the other books for the preparation. The other books you can prefer:

 Books for Mathematics

    Trigonometry by S. L. Loney

    Higher Algebra by Hall & Knight

    Maths XI & XII by NCERT

    Co-ordinate Geometry by S. L. Loney

    Problems in Calculus of One Variable by I.A. Maron

 Books for Physics

    Problems in General Physics by I.E. Irodov

    Fundamentals of Physics by Halliday, Resnick & Walker

    Concepts of Physics Vol I and II by H.C. Verma

 Books for Chemistry

    Organic Chemistry by Paula Bruice Yurkanis

    Organic Chemistry by Morrison & Boyd

    Inorganic Chemistry by J.D. Lee

    Numerical Chemistry by P. Bahadur

You can also follow the below tips:

Make a Preparation Strategy: To obtain the success you should follow a systematic approach. You must prepared a detailed schedule about the topic, chapters & subjects.

Work on Your strengths & Weakness: It is important to analyze your weak areas of your study. Once the strengths & weakness have been identified then you can put your efforts to improve your that areas.

Solve Previous Year Papers: go through with sample papers & its regular practise will get a clear picture of the type of questions asked in the exam.

Join Mock test: Mock test will help you to analyze your performance.

Good Luck!