BBA

Yes, of course you are eligible for M.Com in Christ University
Hope this helps you.
Be free to share any problem you have.
Good Luck!

You need to clear your backlogs first, else you will not get the degree of BMS and with that you can't enroll for CFA.

Annamalai University is amongst the best universities in the country. It provides distance education in BBA. If you want to gain knowledge and succeed in your career, Annamalai University is a good option for you.

It all depends upon the interest. Obviously, you will be studying the subjects of economics in BBA as well. But, BBA is purely business administration. If you want to study economics, then why don't you go for B.Sc. Economics? Think once and then take decision.

It depends upon your interest, I mean you can choose B.Com to get into accounting and finance field which will give you an opportunity to do M.Com and on the other hand you can choose BBA to enter into business filed.

Yes, you are eligible for st. Xavier's Mumbai BMS entrance exam, but I think you should clear CAT exam for Xavier's Colleges.

For BBA and B.Com, it is very simple, they have a mass recruitment and campus placements for high academy toppers, but salary packages are not so good. It is around INR. 1 Lacs to INR. 2 Lacs per annum. So, I will recommend you will choose better University than Punjab University for BBA and B.Com,

For applying to the BBA course in this college you should 50% but if you are from any category it can be 45%.
All the best!

IILM University, Gurugram
University of Delhi
Zakir Husain Delhi College
Indira Gandhi National Open University
Ambedkar University Delhi
Manav Rachna International Institute Of Research And Studies, Faridabad, Haryana
Amity Institute Of Psychology And Allied Sciences, Noida, Uttar Pradesh
Gurukul Institu

Well,
As far I know, you can't switch the course in the middle. You have to start the BBA course from the beginning itself. So, in short, no you can’t switch the course the way you mentioned above in the question.