04. How do I file a return if I finished my degree and have moved home (outside Canada)?
You must figure out your residency status prior to filing. You may see THIS LINK for details.
Note: Indicate that you were a non resident on December 31, 20XX.
You have to indicate your departure date from Canada on the first page of your T1 after you print it. Also don't forget to sign and date page 4 of your T1 and mail to the CRA (scroll down after you click the previous link to find office locations).
You are also supposed to prorate all your nonrefundable tax credits but don't worry since it shouldn't affect your final numbers (unless you earned a lot of income).
For more information about international students and tax filing please see THIS LINK.