Every international student, irrespective of the age and length of intended stay in Québec, will need to apply for the Québec Acceptance Certificate (CAQ).  If the student plans to study in Québec for more than 6 months, or if they cannot apply an eTA to come to Canada, they should apply for a Study Permit as well, after the approval of their CAQ.  The CAQ will take about at least 1 month to process, and the Study Permit will take about 3 months.