You can calculate your rank by using the formula 100- (your percentile)* 869010/100 where 869010 is the no.of Candidates who have appeared for the exam. Going by this your approximate percentile is around 85-87%. For a rank for NITs and IIITs you will need atleast 95 percentile even with SC reservation. Category ranks cannot be predicted because we do not know the no.of SC Candidates who appeared and qualified in the exam yet. So for 95 percentile, you will need atleast 250 and above.