Dear Punit ,
This is not sufficient for IIT .. you need to study more hard.. Concentrate while studying .. revise all before goin to sleep ..
Work more in making concepts stronger and thn do enuf practise untill u r sure that u can attempt any question from that particular topic ..
Focus on basic concepts and study hard with concentration..
Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best .
Amit - IT BHU