Rank to qualify in Jee paper II for admission into NIT in open category

Hello,
If we consider previous year cut off trends for admission in NITs candidates who secured rank within 3000 have gotten admission in NITs offering B.Arch/B.Planning.To secure such rank your percentile must be 97 or above to have decent chances of getting a seat in NIT.It should also be noted that cut off may increase or decrease depending on the number of candidates appeared, number of candidates qualified, number of seats available, difficulty of exam etc.