Colleges in Gujarat

Yes, you are eligible, given that you have scored a minimum of 50% in your UG (45% in case of the reserved class).

Dear,
Yes, you can get admission for B.Com (Hons).

Your academics scores are decent.
All the IIM A and B have a different CAT cut-off.
Like IIM-A's minimum 80%ile and the sectional cut-off is also given weightage along with class 10th, 12th and graduation marks, and work exp. Similarly, in IIM-Bangalore and Calcutta, the minimum is 90%ile and other factors matter too.

Not sure. It can be either way around given that counseling rounds are happening.

More than 99.5 percentile in CAT is required to get the admission in IIM for MBA. You have a good score in 10th and 12th.

None. I would suggest doing a regular course over distance as there is no clarification of whether these courses are approved or not.

You should reappear for the exam and clear it as soon as possible or you can fill the re-evaluation form if you are confident that you should get more marks.

Well, you really have a good curriculum background but still, you have to score well in CAT exam at least above 98 percentile to be on a safe side for IIM-A.

Just go through some of the basic 10th maths and some current affairs and GK along with recent fashion knowledge such as brand endorses and famous startups. That's it. Moreover, sketching and drawing is must.