CBSE 10th

It depends on the cutoffs of various University. But with this percentile you can't get any IIM. Aaj per previous years the average cutoff for any IIM is about 80 percentile, but you may get LIBA, Chennai and XIME, Bangalore.

Yes, you will get admission if your CAT score is above 98+. Hope for the best.

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.