yes ! u can get seat in iit or nit. if u work hard for 6 months. my maths lecturer in institute trained some seniors in mid november, and maked them to get a seats in iit s. the best rank got is about 1200. my sincere advice is if u study a small topic , read it perfectly, and make u r self confident in that topic. and most most important thing is REVISION. always when u got time revise every thing.and read the very very imp topics.

                and from my side I WISH U ALL THE BEST.