Dear Nikhil ,
Yes , you can improve for sure but you have to work hard for that .. study hard and believe in yourself.... the first very important thing is clear and enhance your concepts .. jus keep this thing in mind that building concepts and practicing a lot is damn important for IIT preparation..
Study without loosing the concentration coz studying 2 hours with very good concentration is equals to studying 5-12 hours without any concentration. . and have a confidence in yourself.
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 !!