IIM A has executive mba which requires minimum of 5 years of experience. From ROI perspective it is one of the best. But yes, consider only A category colleges if you are planning to pursue executive mba
totally agree with Pooja on the category of colleges. Apart from colleges like IIMs, ISB, XLRI, colleges offering 1 year course have not very good placement records and most of them depend on IT companies for placements..
If you are working and just wants to brighten up your career, then I would suggest you to go for executive programs being offered. They will provide you the required hike in your career without leaving your current job.
I would suggest that you go for 2 year full time MBA as it has more value than the one year MBA. MBA is a very comprehensive course which cannot by any means be completed within a year.
If you are looking out for good MBA colleges, I'd suggest that you check out Welingkar Institute of Management in Mumbai. They have a wide range of courses and their MBA degrees come highly recommended. Also in terms of placements, they are known to be the best.