Immigration, Refugees and Citizenship Canada (IRCC) has released an update relating to the conditions for issuing study permits, where a student is required to complete a prerequisite program before starting their main program of studies at a Designated Learning Institution (DLI).
To date, Immigration Officers would issue a study permit if a conditional letter of acceptance from a DLI indicated that a student needed to first complete a prerequisite course (i.e. ESL course), before starting their main program of studies at a DLI. The study permit issued would be valid for the entire duration of both programs (prerequisite program of study and main program of studies at a DLI). This study permit would also allow the study permit holder to work for up to 20 hours a week during the semester, and work full-time during holidays.
As of July 13, 2016, the program update outlines that Immigration Officers will only issue a study permit (SX-1 visa) for the duration of the prerequisite program, or first program of study. Students must apply for a new study permit only after the prerequisite program is completed, and must provide evidence that the requirements of the first program have been met.
You can read IRCC's full program delivery update here.