If you have a pre-existing medical condition, etc., it is recommended that you see your doctor ASAP and obtain a medical certificate in English or a certificate in English of the medication you are taking. In addition, you need to declare the condition on the Health Declaration Form, which is a required document to travel to ANU and will be explained at the Pre-Departure Session. The School Doctor may ask you for an interview before your departure, and in that case, please follow the instructions.
Furthermore, if you have those English certificates with you while traveling, you will be able to prove that they are necessary for your medical treatment when you go through the security checkpoint. They may also be helpful for medical consultations during your stay.