IIM Ahmedabad - Indian Institute of Management

To apply for IIM Ahmedabad, you need to clear a minimum cutoff for 10th and 12th marks, which depends on your class 12th stream. Please look at the IIM. Ahmedabad website to find out the exact cutoff.
2 years gap should not be a problem, If you can reason it in the interview.

In my opinion, most people who wants to do an MBA know their reasons for it. Hence, if you are convinced that you should do an MBA, you should. Having said that, here is what probably you wanted to know. What if you go for an MBA at this stage of your, will it add any value?
The short answer is YES. However you should look for executive MBA as you might not get good placement post regular MBA. All IIMs offer executive MBA and general placement is also really good. Alternatively you can apply to ISB or other institute that require GMAT score.

It is widely recognised and enjoys good patronage. It has good infrastructure and situated at a reasonable distance from railway stations of Bengaluru. It is worth joining, for all I know.

I think it's bcom as in bcom you get an overall idea and your horizon is wider not just for MBA but for other professions as well.

MBA admission process should not have an issue if this provided in interview if admission you explain well how you utilised that one year.
Since MBA college will look for current performance in academic only.

See most companies specify they don't want gaps in education more than two years. You can explain your issue if you appear for interview since mostly in verification round.everything is checked. so I think while searching u make sure that you are eligible.