Dear,

Passing marks may vary every year.
As you might know, nift entrance consist of Cat-50% Gat-30% and Situation Test-20% 
So if u have scored well in written exam(CAT+GAT) you can easily get among top 2000 and ofc get selected for situation test. 
This year, the cut off for general in written exam(CAT+GAT) was 41.5 marks. So your marks should be greater than this to qualify for the next round, I.e, situation test. But this may vary year-to-year.

ALL THE BEST.