Dear rahul
Besides NCERT you also need to practice  good level problems for competitive exams so you need to have other books also.
 

All the best.                                                           
AKASH GOYAL
AskiitiansExpert-IIT Delhi
 
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Its true that cracking IIT needs a clear concept.
But Rahul you should practise  a lot of problems from other jee level book.
I would like to refer you some books i.e-
CONCEPTS OF PHYSICS-H.C.VERMA
OBJECTIVE APPROACH TO PHYSICS VOL. 1 & 2-D.C.PANDEY(ARIHANT)
If u have more time and interest left then refer I.IRODOV books.
the above listed of books would get you IIT if you sincerly complete it.
GOOD LUCK RAHUL.........
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