I being already a student of NSIT have always feeled that giving entrance exam is much more easier as compared to taking admission.
we are human being never satisfied with what we get always trying to achieve more and always say to us that we could have done better.
many of you would have got a good rank in iit jee which oyu have only dreamt of getting. but now that you have acheived for what you were fighting for still you are not satisfied. you will be now in a confusion on what course to take and in which IIT.
i sometimes feel that i could hav  got even better rank to get the course of my choice. it is human nature and can't be changed.
as we grow older we always have to take wise decisions in order to gain high success.this is the most challenging time when we have to CHOOSE and always feel that we will not be able to choose.
there are always some positive aspects in every choice if you internally like one of the choices then you start finding the positive traits in that option and you ought to be because it is the whole essence of optism.but you also try to find negative points in other options as well.the problem comes here when you try to support pessimism. what's the fault of other options just because they failed to impress you or some other person didn't try to convince you on the particular choice.
think about it and choose the right option
hope you get the best
GOOD LUCK