i am 12th one subject fail. but i deploma BBA

Yes you can do that.

Hi Divyesh, You will have to first complete your backlog of 12th to get the clearance certificate/ passing certificate and post which can then opt for the diploma/ bba courses. Both Diploma and BBA are different as the first one is short duration non-degree course but BBA is a Bachelor course in B

Fail in one subject in class 12th means you are not 12th pass so first you clear your class 12th then plan other courses clearing class 12th is must for any undergraduate degree or diploma programme

It is possible through open university system.