Hey,

You need to mention the branch as well as it would be quite difficult to suggest books for btech not knowing the branch. Still I'm helping you with some of the books that you may consider for yourself-

Engineering Physics:
Theory and Experiments by S K Srivastava.
Concepts of Modern Physics - Aurthur Beiser (Mc-Graw Hill)
Introduction to Engineering Physics (S.Chand)
Introduction to Special theory of - Robert Resnick - Wielly.
Applied Physics for Engineers- Neeraj Mehta (PHI Learning)


Maths 1 and maths 2- H.K.DASS

Basic electrical - basic electrical engineering ashfaq hussain and fundamentals of electrical engineering by Vincent Del toro both

C programming- let us C by Yashwant kanetkar

Basic electronics - microelectronics circuits by sedra smith

Hope this helps.