Dear Sid, for being eligible for BBA, you should have completed 10+2 from amy recognised board with a minimum aggregate of 50%. Few Institutions conduct admissions based om Entrance Examination and few conduct admissions based on merit in 10+2. There is no specification of subjects. If you fulfil this criteria and will be atleast 17 years by December 31st, 2019, you are eligible for BBA. 

Hello,

For admissions into BBA courses, students are needed to clear the 10+2 or equivalent examination from any recognized board or school. Some colleges consider the criteria of securing 50% marks in the qualifying exam. The age should be between 17 to 25 years.

I hope this helps.