Note – My answer may be offensive so be alert !
No chance bro, if you want to study in any prestigious institute of India then you have to score well. Reservation will not help you in this scenario…
It might be possible that government would increase reservation for OBC upto 50 percent then you can defenetly get into any NIT.
I believe me reality if you are getting 75k OBC rank then you can imagine your situation how worst it is. Don’t rush behind a thing which are out of reach to you. So recognize your limit and give time in that field which passionate you and you have potential to do so.