Dear Student,
I would like to tell you that yes yoy can definately go for bba after taking up science in class 12th.The minimum perctenage required is 50%. I would also like to tell you that with 52% in boards you wont get any good college. The entrance for almost all colleges has taken place. So i would suggest you to drop this year prepare for entrances like NPAT SET.
All the best.I hope this was helpful to you.