Dear Student,
Yes you can get admissions in St. Xaviers kolkata but only in some courses. You can get admissions in B.com as you clear the minimum eligibility criteria of 55% but the cut offs are high for the courses in which admissions are on the basis of 12th marks. However it'll be difficult for you to face the cut offs but if you have any quota it would help you make it. So, yes you can get admission but it's quite difficult. Hope this might help you.