Which course among BBA and B.Com should I pursue after +2 to pursue MBA?

You must go for BBA. It will provide you a strong base and healthy support.

If you are sure about MBA then go with BBA because BBA is the base for MBA and it could be helpful for you.

BBA has more potential in job market as the industry recruits BBA graduates more for its professional to run their business. When BBA with work experience is followed by MBA from a good B-school, it looks more composed and naturally appears more deserving than B.Com + MBA.

Hi, BBA will be a better choice if your final aim is to do MBA. However, there is no such restriction, you can either pursue B.Com or BBA or maybe any other graduation degree for getting admission in MBA program. As mentioned by you, you are from science background, you should definitely go for B.C