Are you asking for Engineering Entrance Exams? If yes then I would suggest you to go through well with your Class 11th & 12th syllabus as mostly the syllabus of the exams is based on your boards.

For JEE Preparation you prefer the books given below:

Chemistry

Chemistry Textbooks for Class 11 & Class 12 by NCERT

IIT JEE Chemistry by O.P. Agarwal

Chemistry by O.P. Tandon

Physical Chemistry by P.Bahadur

Organic Chemistry by Morrison & BoydModern Approach to Chemical Calculations by R.C. Mukherjee

Arihant’s Inorganic Chemistry

Concise Inorganic Chemistry by J.D. Lee

Physics

Concepts of Physics Volume 1 & Volume 2 by H.C. Verma

Fundamentals of Physics by Halliday, Resnick & WalkerProblems in General Physics by I.E. Irodov

Mathematics

Mathematics for Class 11 & Class 12 by RD Sharma OR Maths for Class 11 & Class 12 by R.S. Agarwal

Maths by SL Loney

Maths by Arihant

Incase you have any other query then let me know.

Good Luck!