If the census date has passed for the subjects you are withdrawing from, you may be eligible for a Compassionate Withdrawal if you meet the Commonwealth Government's definition of "Special Circumstances".
Special circumstances must have a significant impact on you and your ability to complete the subject/s you have undertaken to study. Therefore you must demonstrate that the circumstances:
Are beyond your control; are not a result of your action or inaction; and are unusual, uncommon or abnormal;
Occur on or after the census date OR occur before the census date, but worsen after that day, OR occur before the census date but the full effect or magnitude does not become apparent until on or after that day;
Make it impossible in practice for you to complete the attendance and/or assessment requirements of your subject/s.