I guess that you are already on the right track, and I may suggest to be focused and attuned to the topics to be covered, go for an extensive practice session, plus download relevant material from internet for your reference and practice, Planning and preparing for IITs is no doubt a good thing to do, go for it and strive hard to achieve it, and if you could not, then no need to feel disheartened as there are number of private institutions which are doing wonderful job in poviding quality education and best placements, you may consider any one out of these – Sarvottam Institute of Management and Technology, Greater Noida,................Lovely Professional University, Phagwara,.......................JJTU, Rajasthan etc.