Hello,
How come you didn't appear for intermediate and got admission in BA and also you did mba? Some sort of equivalent exam you might have appeared in place of proper 12th class exams.

ANd as per the eligibility criteria of lawset exam:

3 years law degree: 
Graduation degree or equivalent from a recognized University with minimum 45% aggregate (40% for SC/ST Candidates). In case a candidate has scored less than 45% in qualifying exam, he/she should have passed an additional degree with minimum 45% marks.
Maximum age should not exceed 30 years as on December 31, 2019 (can be relaxed up to 5 years in case of SC/ST Candidates).

5 years law degree: 
Intermediate Examination (10+2 pattern) or equivalent from a recognized Board with minimum 45% aggregate (40% for SC/ST Candidates).
Maximum age should not exceed 20 years as on December 31, 2019 (can be relaxed up to 2 years in case of SC/ST Candidates).

I hope this helps you.
Thank you.