IIM

For IIM, one needs to take CAT exam first and then series of interviews.

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No, It will not create any difficulty in any way. The only requirement for selection in IIM is that you should have completed your graduation with 60% marks. As long as you meet this criteria and get sufficient CAT percentile, you should be good.

There is no fixed answer to this. However you are seriously disadvantaged in terms of your percentages. To make up for that you will have to score really well in CAT. In my personal experience you will need at least 99.7 - 99.8 percentile overall. However the criteria to compute composite score changes every year and also the scoring depends on the incoming batch. But in general with 99.7-99.8 percentile you should get more than one call from IIMs.

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All the Best

Academic results matter more than college.

Congratulations, Your academic sound healthy and with your CAT score I'm sure you will get a call. SC category already has lower cutoff, so cheers and party.

It matter alot. Marks are assigned on percentage basis. While graduation marks also been given importance and marks are allotted to them.