See there's no specific criteria of academics which applies to all IIM's.
For example :- IIM Kozhikode and Indore gives good weightage to academics which isn't the case in other IIM's and B-schools.
My suggestion would be that you try to maintain 75% aggregate so that you will not miss out on any opportunity for good MBA school.

Hope this helps :)

Just try to get more and more but above 75 will be satisfactory.

Army Institute of Management, Kolkata

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