BBA

DAVV Indore does not offer BBA for the list of other available courses, check out the link below:
https://www.shiksha.com/university/devi-ahilya-vishwavidyalaya-Indore-51562.

There will be an aptitude test followed by an interview.

Yes, sure you can apply in Stella Marris College. Before that, check your all facilities which you are willing for in the college to join.

No, it doesn't not offer BBA course.

The eligibility criteria for MBA (IB) from AMU is
Bachelor's degree in any discipline with at least 50% marks in aggregate.

The total fees for Integrated BBA + MBA in Business Administration is 1.31 lakhs per year
Follow the link below for more details:
https://www.shiksha.com/bba/course/integrated-bba-mba-in-business-administration-aliah-university-new-town-main-campus-24-parganas-south-kolkata-296395

It depends on how you have written the answer and how the evaluator has corrected the paper.
All the best.

Yes, why not. You can get enrolled in BBA. I would suggest Amity University for distance learning as you have very good marks. So, you can get a 10% scholarship also from there. Amity is a brand name university. It's an internationally valid university and UGC approved. So, it's better to go with Amity.

Yes, you can do BBA or B.Com from Delhi university without maths in class 12th but I want to tell you something, in the second year of BBA and B.Com you will have to study mathematics as it is a compulsory subject so I would suggest if you are in 12th then take maths as well else you will be worried in graduation because 12th mathematics comes in graduation. As you are looking for BBA then I would suggest for other universities also like Annamalai University Amity University, Mewar University, etc.

The deadline for filling the online application form for B.Com (Hons) is closed now, as well as AMU doesn't provide BBA Course.