Not that I know of.
Yes! Sometimes they make you work 4hrs a week which is completely illegal. The Canadian Ministry of Labor should look into this workplace because how they handle and provide hours are sometimes illegal. They take advantage of international students and younger workers in general because they know that most of them dont know their labor rights.
No, it doesn't. At most, you'll be given an interview, though you may be hired on the spot- as it was my case.