Which stream students can study at IIM among science and commerce?

I feel that it all depends on how well you prepare yourself for the Eligibility Testing. Streams may count marginally. So, an exhaustive preparation will surely yield success.

The 12th stream does not matter. IIM-A Eligibility. The candidate must hold a Bachelor's degree, with at least 50% marks or equivalent CGPA. In case of the candidates belonging to Scheduled Caste (SC)/ Scheduled Tribe (ST) and Differently Abled (DA) category, this is relaxed to 45%.