Colleges in Ahmedabad

Refer the selection criteria for PGP (IIM A):
https://goo.gl/xQbr6x
Approx fees: INR 20 Lakhs

INR 20 Lakhs (All inclusive except food expenses).

No, IIM-A doesn't offer MCA course.

Your 12th mark will serve as a huge hindrance for a call from IIM A. I suggest you to try for colleges which are more lenient in terms of acads: MDI/FMS etc.

Yes, in fact the incoming programme PGP has around 5% CAs at IIM-A.

IIM A does not offer BBA. You can pursue your Bachelors degree in the field you are interested in. Speaking about MBA/PGDM, as a fresher, you can either opt for PGDM from any of the IIMs or you can opt for MIM ( Masters in Management) from any college abroad, all are equally good provided you are not looking fro placements. Indian colleges provide placement to students, but such is not the case of foreign institutes. Please find the FT world ranking for MIM: http://rankings.ft.com/businessschoolrankings/masters-in-management-2016

Yes, you can. If not explicitly, then implicitly. It is all about demand and supply.

HL College of Commerce is the best option for you to pursue B.Com.