As per My knowledge to get admission into ST. JOSEPH'S COLLEGE in BCOM course you have to met with certain requirements-

1. In class 12 board exam your score must be 70% + .

But you have told that you Scored only 55% Marks in your board exams then it seems really difficult for you to get into this college.In my opinion you should try for another.

Thanks for support..

Hope you understand this very Well and All the Best...