Hi Candidate,

100 is not a Good Score in JEE mains and Getting a good NIT's is not so easy    

If you're SC/ST Candidate you can get Some average NIT's Since SC/ST Cutoff was below 65 Something and there are fewer chances for an OBC/GEN Candidate Since the cutoff was 75+ which is very closer but still you can give it a try to some low ranked NIT's 

But Make sure that you have Good IPE Weightage#It matters when you apply for a good NIT,

1. If you're SC/ST, Assume you have Scored 100 in JEE and you've 940/1000 marks in 12 then you have more chances of getting a good nit#Here IPE matters always

2. If your friend OBC/GEN have scored 130 in JEE and he has 905/1000in 12 then he has fewer chances of getting the same NIT you got admitted.

Hope you Understand.