hello seema, 

Congrats on scoring such a great percentage.

Unfortunately, St. Xavier's does not offer BBA as a course but you can apply for other courses of management like Bachelor's of management studies (BMS) or Bachelor's in mass media (BMM). These courses have a good scope. You would have to appear for an entrance exam for the same. 

You can go through the following link for more information:

https://www.careers360.com/exams/st-xaviers-college-entrance-test