IIM

GMAT has published an official list of the B-Schools which accept GMAT scores for admission into their MBA programs. Please visit the official GMAT website for a list of schools which accept their scores. In the IIMs, GMAT scores are accepted mostly for Executive-MBA programs.
Regards.

Hi, IIM accepts CAT and GMAT score for executive MBA. https://www.shiksha.com/business-management-studies/articles/important-dates-of-top-iim-epgp-programmes-blogId-14710.

Hi, Minimum Eligibility to Apply
Graduation-Candidates appearing for the final year of Bachelors degree/equivalent qualification examination and those who have completed degree requirements and are awaiting results can also apply on provisional basis. CAT 90percentile
https://www.shiksha.com/mba/course/post-graduate-program-in-management-indian-institute-of-management-calcutta-joka-Kolkata-22931.

You might not be able to get into the top Iims like Ahmedabad, Bangalore, where the minimum requirement is 99 percentile in the CAT exam. You have a fair chance to receive calls from other Iims like:
IIM-Calcutta
IIM-Lucknow
IIM-Kozhikode
IIM-Indore
IIM-Tiruchirappalli
IIM-Raipur
IIM-Udaipur
IIM-Rohtak
IIM-Kashipur
IIM-Ranchi
IIM-Bodh Gaya
IIM-Visakhapatnam
IIM-Amritsar
IIM-Jammu
IIM-Sirmaur
IIM-Nagpur
IIM-Sambalpur
Regards.

Dear Rana,
Well, you can sit and can give CAT but expecting call from IIM is all what you do in exam and interview well you can go for it all expecting call will depend from preparation before exam.

Dear Rahul!
I hope you are much aware about the competition level in Iims. Even if you are able to score more than 70 or 80% in your UG, admission is not guaranteed. However your CAT percentile also matters. Hope this helps. Good Luck.

You require 50% aggregate marks in CAT.

Hi, You need to get 60% in graduation to be eligible for Iims.