Hi
I am not sure about this one. When you are on a study permit, you may be able to get a student work permit for up to 20 hours a week and after you gratuate, you may qualify for a post-grad work permit for up to the same amount of time as your studies, so 1 year studies, 1 year work permit.
It is probably unlikely that most hairdressing schools would qualify for the OP to get a Post Grad Work Permit.
"# a public post-secondary institution, such as a college, university or CEGEP (in Quebec), or
# a private post-secondary institution that operates under the same rules and regulations as public institutions, and receives at least 50 percent of its financing for its overall operations from government grants (currently only private college-level educational institutions in Quebec qualify), or"
PMM