There is both in top IIMs but the criteria is not declared..Every year the criteria was changed from previous year..But the approx dividation is there in particular IIMs Placement brochure..

Since MBA is divarce field and in which the best pedagogy is to learn from each other so the subject diversity is to be needed..

But When you are going from top to bottom the subject diversity is Going to be disapper but gender diversity should be there..