Colleges in Karnataka

Hi,
It could be 15K to 20K if you are fresher. If you have experience then it could be 35K.
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There is no minimum score as such (B has >80% criteria, might have changed so do check)
Put in your best effort for CAT, all this comes later, and you anyway can't change your scores.

Yes, but you need to perform well in GD-PI too.

IIM-Bangalore has some strict percentage criteria for boards (80% above in 10th and 12th, if I am not wrong). So, B might be off the books, but you still seem to have a decent chance at C with a high percentile. I don't want to be blunt, but you will really need to nail CAT hard. Otherwise, try look

Jain University is preferably good. You should go with this option.

Which group did you opt for in class 12th, PCM or PCB?

BBA in Christ University is ranked number 1 at all India level.
Comparing it to other courses that too of other colleges will not be apt.

There is no need to send your marks sheet to apply in this university. It has an interview procedure.
If at all any of the programs require you to submit your documents, you can send the via post addressing IPM of the university.