Hello Sarath
The competition in Paper 2 of JEE MAINS is usually very less than the competition faced by the candidates in paper 1. 85 percentile in paper 1 would land you somewhere near 1 lkh 80 thousand All India Rank.
Even in paper 2, you need a high percentile, as high as 95+ percentile in order to get admission in NITs for B.Arch course.
So, with that percentile, there are less chances for you. But given that you are an OBC NCL candidate, you might get a seat in NIT B.arch depending upon your luck.
Good luck

NIT Manipur (NITMN)

Admissions Courses & Fees Cutoff Placements Reviews

Shortlist

Brochure