Hey Aakanksha,
It depends on you.
If you are satified with your seat and college then you don't need to participate in spot round.
Or if you are interested in spot round and you want to join better college or you want to change your branch then you can participate in spot round.
Candidates can check B.Tech Cut off for Top IITs & NITs here.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile