You can withdraw from units until the last withdrawal date displayed on the Academic Calendar. If you withdraw from a unit after the census date has passed but prior to the last withdrawal date, you will be liable for the full fees of the unit/s, however you will not be academically penalised. If you withdraw from a unit during this window, you will have a "WD" (withdrawn) recorded against the unit on your Academic Transcript.
If you are a student studying on campus, you can withdraw from units via eStudent.
Further information is available on our FAQ.