There are a number of reasons why you may no longer be eligible for the Work Permit that you currently hold, in which case you should surrender your permit to avoid being non-compliant and losing the ability to qualify for a permit in the future.  You should surrender your permit AS SOON AS POSSIBLE if it is not expired and if:

• Off-Campus work permit:
• you fall below the required academic standing (1.60 cGPA or below)
• you are no longer studying full-time
  
  
• Co-op work permit:
• you are no longer in the Co-op program

To surrender your permit, you should:

• write a short letter indicating that you are surrendering your permit and the reason.  It should include:
• your full name, address and CIC client ID number
• a short description of why you are no longer eligible for the permit
• a statement that you are surrendering your permit, and that it is enclosed in the letter
• include your original permit

You should keep a scan or photocopy of both documents and mail them to the closest Canadian Visa Office if you are abroad, or if you are still at UTSC, mail them to:

• Citizenship & Immigration Canada
  200 Town Centre Court, Suite 370
  Toronto, ON M1P 4X8
  CANADA