Mumfi said:
Doesn't necessarily have to be a loophole. Say I studied for 6 months and then decided I wanted to study some more?
There are certain courses that do not require a study permit. However, you should ensure that the course you are pursuing falls indeed within said category. As per the regulations:
188 (1) A foreign national may study in Canada without a study permit
(c) if the duration of their course or program of studies is six months or less and will be completed within the period for their stay authorized upon entry into Canada;
Exception
(2) Despite paragraph (1)(c), a foreign national may apply for a study permit before entering Canada for a course or program of studies of a duration of six months or less.
That being said, it is usually recommended to obtain a study permit (even in cases when it is not required) as already holding a study permit will allow you to apply for another study permit from within Canada.