Canada

If you study in Canada for two years then you will be given three years of visa extension. Once you get a job fourth year of your stay you will be eligible to apply for PR

Hi
You may pursue diplomas, degrees or certificate courses. Check all the colleges here.
http://www.canadian-universities.net/Universities/Programs/Graduate-Studies-Marketing-Ontario.html

A grade 12 student applies for September intake from Oct of previous year till January of same year. If you missed that then you can apply for January intake. For Jan intake you should apply now. Do remember to take IELTS

It will be bad. You can not target a high ranking university as they will see all your scores. Sometimes even from grade 12th. Try to look for a good gre score

Yes but since your score does not seem good enough, don't target a high ranking university. Also appear for GRE n get a good score, that can help. To be safe look for new Zealand, Australia too as these countries are yet not very competitive

In your previous question you said you got 58%.

Sure, it does. Your research on any applied topic useful in current industrial development, will be helpful You understand the subject much better once you have properly researched on the topic.

Hi
Dalhousie, McGill, McMaster, Calgary, Waterloo, Toronto, Saskatchewan etc. are the best ones for biomedical engineering.

Hi Pushkar, to get into the top universities more than 75% is preferred. A first class grade is recommended on the whole. Also, minimum requirements may vary from university to university and vary with programs as well so you must check the desired university website for details.
Hope this helped. Feel free to revert for clarification if any.