After applying for your Canadian student visa an interview may or may not be required. The visa officer will inform you of the time and place if an interview is necessary.
If you move or change your address, telephone number or any other contact information after you submit your application, you must notify the visa office where you submitted your application.
If your application is approved, you will receive a letter of introduction confirming the approval. This is not your study permit. You must bring it with you to show the immigration officials at your Canadian point of entry who will then issue your visa. If you are from a designated country, you will also receive a temporary resident visa. It will be in your passport and will indicate the date by which you must enter Canada. It will also indicate if you can enter Canada only once (a single-entry visa) or if you can enter Canada multiple times (a multiple-entry visa).
If your application is not approved, the visa office will send you a letter explaining why. If you have questions about the refusal, contact the visa office that issued the letter.