Dear Aspirant,
Lets see here that you want to pursue BBA in graduation and you are confused which stream you should choose.
So here is the solution think once, if you are clear about doing BBA then my suggestion for you is to choose commerce stream as it will create a base for doing BBA and you will have basic knowledge about the subjects.
If you choose science stream then go for BBA then it will tough for you to understand the concepts, subjects etc.