Colleges in Mumbai

For CBSE board, the required cutoff if about 95%, while for other boards the cutoff above 90 can be good enough for admission.

The overall cut off required for UBS Chandigarh Admission by a general category student is expected to be around 90 to 92 percentile. Hence your chances are very high.

Your % in 12th seems very low to get admission in this college. See this link for more information:
https://www.shiksha.com/humanities-social-sciences/course/bachelor-of-arts-b-a-st-xavier-s-college-mahapalika-marg-mumbai-110116

As per Maharashtra State Technical Diploma Courses Educational Institutions (Admissions) Rules 2019, The other states candidates are eligible for Institution quota only. So you have to contact to Principal Government Polytechnic, Mumbai for further details.

Yes, Part-1 exams of M.Com distance learning of University of Mumbai will be held in two semesters.

https://www.shiksha.com/humanities-social-sciences/languages/course/m-a-in-english-manipal-centre-for-philosophy-and-humanities-155697.

Ranking for the colleges are as:
Welingkar
Nirma
BIMTECH
LBSIM
Hope it helps.

Yes,you can. The biotech students got placements in various healthcare and pharmaceutical companies such as rb, dr reddy.