Canada

It depends on what you want to study. Besides the English tests like TOEFL or IELTS, you must prepare for GMAT or GRE if the program is MBA or Masters and entirely depends on university requirements.

No, MCA degree is not available abroad. Similar programs by the name of MS or M.Sc is found. You must check the details on any university's website.

Yes, Seneca is one of the more popular colleges among Indian students. However, please mention if you are talking about the graduate certificate course or Diploma course.

Almost all courses except mathematics and accountancy. Please mention your academic details and if you are looking for an undergraduate or a post-graduate course to get a more precise answer.

Scholarships for universities abroad are a domain of the college itself. So if you are applying to a certain college, the admission officer will automatically shortlist you for scholarship if your profile is eligible. In most cases, you don't have to apply separately for scholarships.
You need to get in touch with the university or college of your choice. Ask them about the eligibility criteria for scholarships are they are different for each institute.

Please mention which course and colleges are you interested in applying to.

Province does not play a vital role in studies, so you have to choose a university as per your profile, and the reputation of the university, but southern Canada is a little bit better for core engineering.

To get an exact answer, please clarify your question.