Canada

You can write to the university of your choice as every university has a different policy concerning backlogs. So we can't provide any generic answer as it depends from university to university.

You can apply for student visa only after you are accepted at a canadian university. So you need to start the process once you receive letter of confirmation from the university.

you can pursue an undergraduate diploma after your 12th as well, but if it is a post-graduate course then you need to finish your Bachelors first.

Following are the best universities in Canada:
-University of Alberta,
-Toronto University,
-University of British Columbia,
-University of Winsdor and many more.
You can search https://www.shiksha.com for the same.

Supply chain management is a never ending process in any country, so don't worry about the scope, first do it.

I don't know whether it's the best place or not but Canada is the most cost effective country for students who wish to study abroad. Also, while studying in Canada you would be able to recover your fees by working there, so you will get back what you would invest. Secondly, Canada is the only countr

Yes you can and after getting PR there, you can continue your studies at domestic rate.

Approximately 15-30 days.