Hope this helps. Good luck.
firstly for having admission in UPES for BBA you need to score at least 50% in your class 12th and 10th also.
UPES conduct annual GD/PI, you will have to register for it on their official website, and it depends on your rank whether you will get seat or not.
apart from this admission in UPES for BBA can also be done on the basis of management criteria.
I hope you got it.
Feel free to ask any query in comment section.
Best of luck.