In order to prepare for physics for engineering you should clear your basics. Work on your concepts and fundamentals. 

You can take help of NCERT books. Apart, from NCERT books you can refer to HC Verma, DC Pandey, I.E. Irodov, Resnick, Halliday, Walker and S.S. Krotov.

Solve past year problems to understand the exam pattern and level of the questions. 

All the best!!