Wow you got good percentile .I can give you rough idea about your rank.As rank can't be estimated through percentile score.It only tells about relative performance of candidate.You can use this formula to get rough idea about rank in general category::Probable Rank= (100- NTA percentile score) X 874469 /100.Your Probable rank is 83k in general category.You will get lot of NITs through this rank as you SC Candidate.

For assurance wait till NTA decalres rank and cuttoff for each category.NTA will declares rank after 2nd phase of jee mains exam.

You can ask if you have any other queries.

GOOD LUCK!