Hello.
For BBA aviation a candidate  need to be eligible with having at least 50% in his/her class 12th from any recognised board, there might be relaxation for other categories, as you didn't mention university name so I would like to inform you that eligibility criteria may vary accordingly and there are various universities which takes admission in BBA course on the basis of their entrance exam and some take admission on the basis of merit of class 12  so see accordingly, now it's a 3 year full time course, after this course you will be having good opportunities in aviation industry where your responsibilities and duties will be related to handling and dealing with the problems in the industries like aviation, after successful completion of your post graduation in the same you have good opportunities in the following area:

• Credit control manager.
• Airport manager.
• Assistant  airport manager.
• airport operation manager.
• Test manager.
• Program mmanage, or in many areas.

Best of luck.