Colleges in Karnataka

Well, if you've heard for reliable sources like The Hindu or the Economic Times it is true. The salary at the top 3 IIMs are very high.
Before I mention the salaries, let me start by saying that there are two types of placements:
The Summer Placements: These are internships and salary may range from a

Yes, maybe, you can get a scholarship as their are different categories of scholarship that SC candidate get.

Yes, you can have a scribe to write the exam but first the university will analyse the real problem with your handwriting then exam department will decide whether scribe should be allowed or not.

Yes, you can apply for MBA course. You will get better & in depth knowledge of business management that will help you further in your career either in the field of finance,marketing or HR.

It depends on the home state and category. If you belong to any respective NIT's home state, you can easily get a seat. But in other state case you can get mechanical and civil in NIT Puducherry and civil in NIT Surathkal.

Yes, you can get admission but you have to start from first year again.
Good luck!