There are numerous factors that influence your admission. But, to be honest, IIM Calcutta has the most straightforward selection criteria. All you need to do is get a CAT score of 99.8% or higher and you'll be contacted. This may appear vague because 99.8% is a big deal, but it's comparatively simple because you may not receive calls from IIMA or IIMB even if you score 99.99%.
Other determining factors include
Finally, consider your graduation option. If you are not an engineer, you have a better chance of getting an MBA in college.