What i do for iit jee 2012 from today without any class. Because i am doing 11 and 12.pls

Which standard are you in right now? There are two ways: either to go for self-study which most people find difficult or to go for coaching institutes (any reputed coaching centre depending on what suits you based on location, fees etc.) You can also choose the middle path and join a coaching centre plus self-study but you need mentoring even in self study. The way in self-study is to have a resource at your command whenever you want it and that increases your concentration plus gives you time to understand the concepts e.g. DVDs that teach you the latest syllabus. You can order a free demo DVD from here http://www.kaysonseducation.co.in/