Hi Amrit, I studied NCERT books myself for my JEE way back in 1996-97. The books have been written for a very good understanding of the subjects. You must read NCERT books.
Apart from that, you can read the following books: Physics H C Verma (Part 1 and 2) Kumar and Mittal (Part 1 and 2)
Chemistry Comprehensive Chemistry (CBSE board) Organic Chemistry by Morrison Boyd Concise Inorganic Chemistry by J D Lee (check for the latest edition)
Maths CBSE board books Plane Trigonometry by S L Loney Elements of coordinate geometry by S L Loney Algebra by Hall and Knight