To renew your visa, you should lodge your application with the Australia Government Department of Immigration and Border Protection (DIBP) a minimum of 4 weeks (28 days) before your current student visa expires.
You will need to start this process at least 6 to 8 weeks before your current student visa expires.
Please note that you need to have a chest x-ray done at least 2 weeks before your visa medical examination.
The table below provides a timeline guide:
If you have any questions on the above information you can submit a question via USQAssist > Ask a Question (Question Type: Other).