yesir, i understand your query regrding the admkssion seats in st. xavier mumbai as i would like to give you in brief about it with all its detail through the official article link of the career360 as follows:

https://www.careers360.com/colleges/st-xaviers-college-mumbai/bms-course

but if you still have AY QUERY ask me in comment section as i hope this article will clear all your query.

best of luck!!