Some students will not require a medical. It depends on your places of residence over the year immediately prior to your application. These are designated by Citizenship and Immigration Canada. For a list of DMPs worldwide, click here . Most major educational institutions have their own insurance plan for international students and will help you register and pay fees on arrival.
Health care is very expensive.
Yes a photocopy is acceptable. An interview is not always necessary. Interviews are sometimes required for clarification of information you have provided in your application. Yes, under most circumstances. If you then wish to continue in a regular program of studies, you will need a student authorization.