• Make your own notes in the form of key points and formulas
• Revise these notes daily.
• Solve all last year question papers
• Refer good standard books
• Make proper time table

Refer HC Verma, Arihant chemistry, O P Tandon chemistry, R D Sharma mathematics

You can follow below books for preparation

PHYSICS

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

2-Fundamentals of Physics by Halliday, Resnick & Walker

3- Problems in General Physics by I.E. Irodov

MATHEMATICS

1- Maths XI & XII by R.D. Sharma

2- Plane Trigonometry Part 1 by S.L. Loney

3- Plane Co-ordinate Geometry by S.L. Loney

4- Higher Algebra by Hall and Knight

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

CHEMISTRY

1- Physical Chemistry by O.P. Tandon

2- Organic Chemistry by Paula Bruice Yurkanis 

3- Organic Chemistry by O.P. Tandon

4- Inorganic Chemistry- Chemistry XI & XII by NCERT