BCA

Look every college or university has it's own eligibility criteria. So the college or university you are looking for go through it's website.
Some preferred 45% and some 50% as minimum.

Every Degree has their own value and importance. SEE you have to choose those course in which you are interested in. I am sending you the three links of these three courses from which you can get detail information about these courses and you are able to choose the course in which you have interest. B.Com course link-https://www.shiksha.com/b-com-chp
BCA course link-https://www.shiksha.com/bca-bachelor-of-computer-applications-chp
BBA course link-https://www.shiksha.com/bba-bachelor-of-business-administration-chp.

Yes, you can, This course also similar to BCA course.

Hi,
Yes, you can do MBA in Aviation after completing the BCA course. Those candidates who have completed their Graduation in any discipline are eligible. First preference will be given to the candidates who have completed Graduation with Commerce or Economics background and having to experience in the field. Good luck.

I am sending you authentic and trusted link from you get all your doubts related to Best colleges for BCA in Delhi
link-https://www.shiksha.com/it-software/colleges/bca-colleges-Delhi-ncr.

I am giving you authentic link from where you get all information of BCA course in Best colleges in Shimla. link-https://www.shiksha.com/it-software/colleges/bca-colleges-shimla.