CAT Cutoff is 60 for all IBS Institute.
Currently IBS Gurgaon cutoff is around 73percentie after GD PI.
Hope it clears your doubt.
All the best
Mostly getting into IBS Gurgaon is on the basis of your profile. your 10th, 12th, graduation and gdpi matters alot to get into the college. They not only accepts CAT Score but also other management aptitude exams like NMAT, MAHCET, CMAT, XAT.
If you have scored above 75 percentile then your chances are great if not you can give IBSAT entrance exam to get eligible for gd/pi.
wish you all the best .