As you asking for the RPET Examination let me tell you that the RPET Entrance test is Replaced by the JEE Main Examination , the JEE Main Examination is Now Consider as a Common Entrance test for Admission into the Engineering Courses of India

Here I am giving you the names of the Some good books for the JEE Main Examination

Physics

HC Verma Concept of Physics Part 1.
HC Verma Concept of Physics Part 2.
IIT JEE Physics by D.C. Pandey.
Problems in General Physics by I.E. Irodov.
Physics for IIT JEE by Resnick, Halliday, Walker.
Problems in Physics by S.S. Krotov.

Chemistry

Organic Chemistry by Morrison Boyd.
Organic Chemistry by O.P. Tandon.
Inorganic Chemistry by O.P. Tandon.
Modern approach to chemical calculations by R.C. Mukherjee.
Numerical Chemistry by P.Bahadur.
Concise Inorganic Chemistry by J.D. Lee.

Mathematics

IIT Mathematics by M.L. Khanna.
Differential Calculus by A Das Gupta.
Class XI and XII Mathematics by R.D. Sharma.
Trigonometry, Geometry Books by S.L. Loney.
Problems in Calculus of One Variable by I.A. Maron.
Higher Algebra by Hall and Knight.