BBA

If you want to join BBA, you can consider The NorthCap University. They have great infrastructure and best faculty. As you mentioned about the fee structure, it is very affordable at this university. For more information, please check: http://www.ncuindia.edu/programmes/bachelor-of-business-administration/.

Check out the article below for details :
https://www.shiksha.com/bba/articles/integrated-mba-programmes-in-india-blogId-15044.

I would recommend you The NorthCap University, this university is located at Gurgaon Haryana, NCU has great faculty and amazing placement services. If you want to make a career, please consider NCU. For more information you can visit: http://ncuindia.edu.

Yes dear, you will have to register online on the university's website. Also, you can visit in person to the college. They will let you know the admission process and criteria. Furthermore, there are toll free numbers available for several universities, you may please call on the same to find out which university has what what criteria for admission.

If you plan to opt MBA further, BBA is a better choice. It will give you an idea of how we go about business administration. However, if you want to go for CA B.Com is an obvious choice. Moreover, it would be better to do BBA (Hons) than simple BBA so as to do specialisation in Marketing, Finance or something.
All the very best to you dear!

No, BBA does not have legal reasoning.

Yes, you can pursue BBA after completing class 12th in any stream. You need to have some essential subjects in HSC like language subjects.

The percentile is really low, and it is difficult to get good B-schools with such percentile. You either try to write CAT and other management exams again. Prepare well. Good luck. For any queries leave comment below.