Hello Shubham

yes ,you are belongs to sc category then you can get the NIT seat .For the 80 percentile in JEE mains will never get you into any NITs if you belong to general or OBC category. But if you belong to SC and ST category you will get into some of the NITs for sure. But if you're a general category student , you will have to score as much as 95-96 percentile for minimum to get a seat in NIT seat.

Hope this helps you...