Colleges in Ahmedabad

Masters of Business Administration can be done externally you will have to ask for the same in the institute from which you want to persue. some of the institutes gives this facility where you just have to submit assignments and go for examinations. Do check the same.

The one scores around 98 and above % ile in CAT with good curriculum will get the calls from top colleges in the country.

It is very nominal at 15000/annum.

No, you should have good grades in whichever stream of engineering you pursue.

You should target 99+ for IIM's. You might get a call from FMS with 97-98 percentile.

There are chances, if you are a non-engineer with a 99+ percentile. It is much more difficult, if you are an engineer as that would require a very high percentile in order to stand at par with other candidates.

No, you need to go through the 2 year course, which will mean you have to start afresh.

I don't have much idea about GMAT.

You should aim for an exceptional percentile, i.e. above 99.9 to stand a chance.

It is highly unlikely to be honest. All the best anyhow.