I am assuming you are from general category. A lot depends on your profile. Assuming you have a decent overall profile(85%+ throughout), you will be needing above 99.5 percentile to get a call for the next round.

All the best!

The candidates are short-listed through Academic Writing Test (AWT) and Personal Interview (PI) from among the candidates who have a valid CAT-2017 score. To check the complete detail about admission you can go through  with given below link.

IIMA Admission procedure