hola i am coming here after a long time here its still the samenow it really matters how bad u need to goto that college if u were really iit sick u would havent asked this but leave it blah blahas far as u r time goes do onething if u r cbse guy then do u r boards thoroughly it would really help u dont mugg up anything simply imagine physics and make mind reactions in hemistry and explore abstract equations of maths and well if u have a shani named classes wid u den focus only from the board point of view thats enough for iit but remember imagine keep imagining be creative