Personally I flunked IIT Mains because with my ADHD I could not get myself to study more than a few hours every week.Also at the ripe age of 17-18 I did not have enough drive or ambition to stop doing the things kids love to do (chasing girls, watching movies, loafing around etc etc.) But then I am actually proud that I did not give in to the IIT bullshit and did whatever I wanted to do. You will never get that age back no matter how successful you are!