Health requirements
To study in Australia, you must prove that you are in good health. To do this you will have to provide a certificate after a health checkup. Both should be done by empaneled doctors. You can get your health checkup done before your visa application. Getting it ahead of time can help quicker processing of your visa.
Character requirements
You should have proof of good character to get your visa. This means you should have no criminal record and for this you may need to get a police certificate. You will need to fill in a form called the Character Statutory Declaration Form when submitting your visa application.