First of all, be thorough with the CBSE 12 syllabus for physics, go through the exam pattern, study NCERT books and you can also take the help of some reference books for physics. I have shared the link, go through it -   https://school.careers360.com/articles/best-reference-books-for-class-12-cbse-physics

It will guide you.

Hii buddy right now not much time is left I guess you would have started your revisions if not start it soon,daily solve past year papers and prefer NCERT Book because it's reliable and beneficial for CBSE students, don't worry and study well for the exams good luck.