In the article on renewing the study permit or restoring the status, it is discussed how to renew the student status, as well as work while studying, etc.
How can I renew my student status?
If you want to stay in Canada for a longer period of time, you will need to renew your study permit. You must apply to renew your study permit at least 30 days before your current permit expires. However, we recommend that you apply more than 30 days before the expiration date.
If you need to renew your Social Insurance Number (SIN) or health insurance, a valid study permit is required. If you wait until there are only 30 days left, you may have trouble renewing these because your study permit has expired.
Check processing times to see how long it will take to renew your study permit. Learn how to apply to renew your study permit.
Work while studying
If your study permit does not include a work requirement, you can apply to have it added if you are eligible to work off campus. There is no cost to include these terms in your license.
Before you can apply for a SIN number from Service Canada, you must first apply for an amendment to your study permit.
How many hours can you work away from campus?
During the regular school semester(s), you can work up to 20 hours per week. You can work more than one job to make up these hours as long as you comply with the conditions of your study permit.
During scheduled breaks of the school year, you can work full-time if you are on a scheduled break, such as winter or summer break, or a fall or spring reading week. You are free to work overtime or two more part-time jobs than usual.
You must be a full-time student to work full-time, both before and after breaks. You cannot work during the holidays before the start of your first semester.
How many hours is considered full-time work?
There is no specific number of hours per week that constitutes “full-time” employment. However, your employer(s) must follow all provincial laws regarding overtime pay and time between shifts. If your schedule has no scheduled breaks, you can only work 20 hours a week. The weekly limit of 20 hours has been removed. During regular school terms, international students in Canada are usually only allowed to work off-campus for 20 hours per week.