Perhaps in Queensland there is some sort of qualification at Assoc. Diploma level for medical receptionists. I'm not aware of it - but then...I don't live in Queensland.
They are also asking for relevant work experience in general practice - and yes - that does mean in a doctor's surgery.
I would suggest you contact the practice and ask them about the qualification required. If they're making it an "essential criteria" then this may not be the job for you.