What kind of proof you are pointing to
Doesn’t say exactly. I think you’ll have to figure out the best way to indicate this based on your situation.
“When you travel to Canada
Make sure you have proof that you’re exempt from the travel restrictions and that you’re travelling for a non-optional or non-discretionary purpose.
When the border services officer greets you, they will look at several factors, including
your non-discretionary reason for travelling to Canada
your ability to complete a 14-day quarantine period as soon as you arrive at your final destination
if you either
have time to complete your quarantine before you physically attend classes,
or
can study online during your quarantine”