If you have a graduate or post-graduate diploma or certificate
You must also have completed a post-secondary diploma or degree (from Canada or from abroad), as a prerequisite to this graduate or post-graduate program.
You must have competed this prerequisite diploma or degree in the 5 years before you started your graduate or post-graduate program.
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/hong-kong-residents-permanent-residence/eligibility.html