ihave wasted my time in first year .how could iget through iit 2012 exam

Don't think about what you have lost.Start preparing for 12th class from now,start with NCERT ,then competitive books and make your daily target and try to complete it as soon as possible.After completing it start practicing for 11th questions taking a rapid look at the topics.Remember, never loose your confidence, don't think negetive about "what wil happen if" and something like that.You have to develope a passion for it and it is you who is going to crack IIT.Make strategy for studies what suits you the best and the main thing is that you have to work hard and work hard and work hard..... Teacher can only guide you.

                          GOOD LUCK