Hello abhishek
As for now it's very difficult to say the rank based on percentile as it will depend on the number of students giving the exam..Still you can use the formula rank =(100-percentile)*874469/100
This rank is subjected to change based on the april session and hence is not final.You can predict your rank based on this and also some colleges.But let me say you htat with such a percentile,I don't think you will be getting any NIT.I would suggest to prepare well for the april session and do it nicely.

Good Luck!