Does a CFA degree help in summer and final placements at IIM Ahmedabad/Calcutta for top banking firms?

Yes, the CFA degree will very likely fetch you a decent package at IIM Ahmedabad or Calcutta. This is because companies prefer their interns and analysts to be well versed in subjects from finance and economics. CFA charter is an easy way to ensure that eligibility requirement.

Some organisations conduct prior interactions with the would-be interns before the actual interview. Here, junior executives interact with the future interns and offer pre placement offers.

So this degree will help you get the interview call but the rest depends on your performance in the interview. CFA degree is definitely a game-changer.