Dear student,

The minimum percentage required to get an admission in St. Xavier's College is 45% of marks in the compulsory subjects of your 12th standard from a recognised board. If you are having less than 45% marks in your 12th standard, your application will be rejected and you are not eligible to get an admission in the St. Xavier's College.

For admission in B.Com, B.A and B.Sc courses, you need to have an aggregrate of 60% marks in your 12th standard from a recognised board. Since, you have the chance of getting 75% of marks in you 12th standard, you can easily get admission in this college.
Hope this might help you.