IIM Ahmedabad - Indian Institute of Management

You should either opt for finance or business management as they will suit your educational background.

IIMs consider only CAT for admission to their MBA programmes they do not accept any other management exams.

Most probably it ends by the mid of June because the new session starts from the last week of June. So they complete all their formalities by the mid of June so that there is no clash of duties.

Scholarship offered is maximum at Rs 3 lakhs per annum.
Total fees go upto Rs 18 lakhs for two year program, the return on investment is best and so is the brand which is needless to mention.

To get admissions in tier 1 and premier colleges, you need at least 50% marks in graduation. IIM - Ahmedabad has cutoff of 99.5 percentile in CAT.

IIMs do not accept MAT scores for their admission process. IIMs conduct CAT. CAT scores are used by IIMs for selecting students for PI and WAT .

A good percentage in 10th and 12th are:
50% and above in graduation,
99 percentile in CAT (general) ,
89 percentile in CAT (SC),
and 85 percentile in CAT (ST).
Then you will also have to convert your calls.

You can not join IIMA without appearing for CAT examination.

For IIMs it is totally impossible. Look these institute are the top institutes in our country. If you really want to study here than you will have to strive for it. People here have secured admission for their merit not their money. So why not invest some amount in your preparation, so that you can

No it's not possible without an entrance test. If you really want to take admission in an IIM or any other reputed institution for that matter, you need to give an entrance test.
Hope that helps.