For physics go for HC VERMA + DINESH. This is because hc verma problems with help you to perform well in JEE and DINESH will help you to understand concepts better. Along with these two books you can refer to NCERT exemplar.That is a short book and you can solve it with ncert
For chemistry IIT CHEMISTRY BY OP TANDON + NCERT is the best choice. Go for it
For maths: NCERT+ NCERT EXEMPLAR+ R.D. SHARMA IS A GOOD CHOICE. R.D. SHARMA IS A GOOD BOOK FOR BOTH MAINS AND ADVANCE. SO NO DOUBT YOU CAN CHOOSE IT
See dear as you are saying you had not studies more, this is the best combination. These books will offer you a great conceptual clarity and will help you to crack IIT
