If you're not happy with the units you're enrolled in and you want to change units, you need to check the cut-off dates for adding and discontinuing units.
It's also important to check the census and penalty dates for your teaching period before dropping a unit, or you may face academic and financial penalties. These include having a fail recorded on your academic record and incurring fees or a loan debt.
You can use the Web Enrolment System (WES) to add or discontinue most units. Simply go to the section where you entered your units to make your changes. If you're unable to enrol in a unit in WES, submit an Enrolment Amendment form
Domestic students
You can actually drop units after the census date, but you'll still have to pay the fee.
If you drop a unit earlier and meet the census date deadline, it won't appear on your record and you won't be charged any fees.
International students
The rules may vary if you're an international student on a visa. Generally you need to maintain a full study load and need permission to drop units. Talk to your faculty first.
Course rules
Before making changes to your enrolment, you should check your course rules (for core units, prerequisites or corequisites) or talk to your faculty.