CBSE 10th

As per your previous marks, chances are less, but still, if you try to score above 98+ in CAT then, maybe you will be callwd as an interview.

At least you have to score 95+ in CAT to get the call for an interview.

Yes, you have to add all the subjects to get admission in a school for opting commerce.

https://www.shiksha.com/mba/cat-college-predictor
Here is the tool which you can use to get prediction of the college according to your score range.

You can go for textile courses.

Yes, you can apply for the entrance exam of IIM Indore.

Class requirements for hospitality studies typically include training in accounting, marketing and business systems, property and human resource management, and labor and liquor laws.

Since getting into IIMs is for a class which has millions of students, the average student is probably a 6 pointer. Well, 15% of IIM Calcutta Batch of 2019 are 6 pointers or worse. So, yes, IIM Calcutta has a lot of average students considering only academics. But, an average student cannot make it to IIM Calcutta.

https://www.shiksha.com/mba/cmat-college-predictor
Here is the tool which you can use to get a good prediction about the college according to your score range.

Your marks are pretty good, the only problem is with graduation percentage since it can reduce your chances to get admission in a reputed MBA college. You can appear for MAT and also secure admission in a B-School but just make sure you can justify the valid reason for graduation marks/percentage. Good luck.