If you want to extend your stay in Canada as a student, you must complete the Application to Change Conditions or Extend Your Stay in Canada. Check the expiry date on your study permit, and make sure you apply before that date. You should apply for renewal at least 30 days before your current permit expires.
If you apply for a renewal of your study permit, and the permit expires before you receive an answer, you can continue to study in Canada under the same conditions until you receive a decision.
You should apply to renew your study permit if you intend to travel outside Canada and your permit will expire while you are travelling.
You cannot extend your study permit beyond the expiry date on your passport.
If your study permit has expired, and you have not applied for an extension, you must leave Canada.
Restoring your status
In some cases, you may apply to restore your status as a student within 90 days of losing it. You may only apply if you have continued to meet the requirements under which you were allowed to enter and stay in Canada and you have met all the conditions imposed on your permit.
After you apply to restore your status, you may stay in Canada until a decision is made on your application but you are not allowed to study until your status has been restored.
There is no guarantee that your application to restore your status will be accepted. On your application, you must provide full details of all the facts and circumstances that caused you to lose your status.