Honestly, GIBS doesn't make the cut-off part too strict. They keep it very student-friendly.
For PGDM admissions, even if you have a decent percentile in CAT, MAT, CMAT, or XAT, you can apply. Usually something around 55–60 percentile is more than enough in most exams.
GIBS looks more at your overall profile, communication, interest in management, and how you perform in the interview, not just your exam score. So even if your percentile isn't very high, you still have a good chance because GIBS believes in giving opportunities based on potential, not only numbers.