I have 202 marks in JEE Mains paper 2, scored 16105 rank and 898 SC rank. What are my chances to get admission in NITs?

Assuming you are from general, chances are very less as there is a fixed no. of seats in only one branch, where almost the same no. of students applied as that for multiple branches in paper one. Moreover, below are the colleges which have almost the same reputation as that of NITs and suit your m

You have a very good chance with under 1000 rank in SC category. You'll get a decent NIT most probably your home state for sure. All the best.