From the CIC website:
"You must have studied full time in Canada and you must have completed a program of study that lasted at least eight months.
In addition, you must have graduated from:
-a public post-secondary institution, such as a college, trade/technical school, university or CEGEP (in Quebec), or
-a private post-secondary institution that operates under the same rules and regulations as public institutions, or
-a private secondary or post-secondary institution (in Quebec) offering qualifying programs of 900 hours or longer leading to a diplôme d’études professionnelles (DEP) or an attestation de spécialisation professionnelle (ASP), or
-a Canadian private institution authorized by provincial statute to confer degrees but only if you are enrolled in one of the programs of study leading to a degree as authorized by the province and not in all programs of study offered by the private institution."
So if the school falls into those category, you can get a PGWP