The cutoff generally varies year on year. Minimum eligibility is 45percent marks in graduation and should have appeared for XAT/CAT/IRMASAT. The cutoff for OBC category is averaged out near 62 percentile for CAT and XAT.as per previous trends. You can also appear for IRMASAT conducted jn Feb 2018 for MBA Or PGDM course. IRMASAT cutoff is 45 marks out of 100 as per 2017 trends.

IRMA follows the statutory reservation policy of Government of India. That is:
SC     - 15%
ST      - 7.5%
OBC   - 27%

Now to get into IRMA through CAT/XAT aim getting above 65-70 percentile and you will  make your chances. (OBC category)

All the best!