Hii yadav,

First of all Greetings to you for getting a good score of 72 marks under the stream of Mechanical.This is well enough to do your masters in a good IIT/NIT.

As gate is score is valid for 5 years you will get a seat in NIT.But major preference is given to the candidates who are appearing in 2019 GATE.As you are from OBC category you are having high chances of getting seat in NIT and it also depends on the difficulty of the paper .

All the Best..,

Thank you.