Canada

You will generally get offer letter easily from colleges in Canada. But Visa might be a issue. The case with backlogs are generally a problem with Canada. They only allow 4 supplementary exams. Since you have completed your M.Tech that usually wouldn't be an issue. But it depends. If they are only considering your M.Tech, then you wouldn't face any issue. The college and the Visa processing authorities may also check your Bachelor's history. Contact an education consultancy as well, they have good contact with colleges. They can for sure assist you.

Almost, all the universities around the world (UK, Australia, Canada, etc.) accept GMAT and IELTS test score for MBA course. IELTS can be exempted, but not GMAT.

Best universities for MS in Computer Science in Canada:
University of British Columbia (UBC): The UBC Department of Computer Science, established in May 1968, is one of the top computer science departments in North America.
University of Waterloo
University of Toronto
McGill University
McMaster University
Queen's University.

There are many good colleges in Canada. What course you want to opt there?

Yes, you can do BBA in Canada, but check for requirements laid out by the college.