Change of preferences
You can add, delete, or change the order of your preferences as many times as you like during the offer period.
If you receive an offer in any round you can change your preferences for the next round. However, some courses have early closing dates for applications. For example quota courses and those with additional selection criteria such as auditions and interviews. If you wish to apply for one of those courses, you must do so before the application closing date.
Visit the UAC website for detailed information about how to change your preferences.