Science

Biotech is a science and research oriented study as you already know. You need to put time in some self-analysis, about whether you want to be a Lab person and want to do intensive research or you want to get into field to sell, manage and plan things. If you are interest in management, and if it matches your skills, you should opt for MBA. And, if you want to pursue Research in the same field, then remain in M.Sc.

Hello Imran,
You have done M.Sc in maths but wants to pursue MS in Computer Science from Canada. It's of course gr8 to know your dreams. Even though Institutions abroad normally offer wide variety of choices, jumping into computer science without any background, I am afraid may not be feasible. However I suggest you approach agencies dealing in sending students to Canada to find out if there is any chance for you.

There are a lot of universities which offer integrated M.Sc. ISRO, IISER, IISC are some of those which are the best.

M.Sc in biochemistry is a better option as a lot of medical companies are nowadays looking for M.Sc in biochemistry graduates.

Hi,
After graduation in whatever field it be, you can always go for bank PO exams or SSB. You could also go for AFCAT which along with adding value to your resume would give you a job in a year.

Hi,
Having Commerce in your intermediate has a lot of options for you. You could go for BBA, B.Com, BBM as these are some of the options. Choose wisely. All the Best.