For IIMs, necessary criteria for 2 year programs is that you need to get very high percentiles in Cat. But if you are a foreign national, Gmat is acceptable in your application. Instead if you have more than 5 years and preferably less than 12 years of workex, you can enroll for EPGP program through Gmat. The range for Gmat scores is 690-760.

Apart from this they clearly mention that work-ex should be valid. Generally Home Business or related domains are not preffered, unless you have a proffesional backup, for example if you are a part of a startup with Amazon and working from Home and have made it big over the years, it is acceptable.

Smit- IIM-Amritsar PGP/04.

If you are an Indian resident, then you would have to appear for the Common Admission Test if you are planning to take admission in 2 year post graduate program in IIMs. GMAT Score is only accepted for foreign residents who wish to persue the PGP course. However, GMAT scores are accepted in IIMs for 1 year Executive courses.You need to have 5 years of work experience for EPGP Programs. The GMAT Scores for EPGP range from 690-780.