Each state and territory have a different system to apply for university. Check it out.
Tertiary Admissions Centre
A Tertiary Admissions Centre (TAC) is a state-based central office that receives and processes applications for admission to many higher education providers (providers). Rather than applying separately to each institution, TACs streamline the application process by accepting a single application from you that contains a list of preferences.
If a TAC does not represent the institution where you want to study, you should contact the institution directly about their application process.
ACT and NSW
The University Admissions Centre (UAC) is a central admissions office for people applying for entry to undergraduate courses in New South Wales and the Australian Capital Territory, and some TAFE courses in New South Wales.
The central processing area for participating institutions to receive and process applications. One application can cover up to six different tertiary courses.
The South Australian Tertiary Admissions Centre (SATAC) can give information on courses and how to apply to the universities and institutes of TAFE South Australia and four universities in SA and NT.
The Western Australian Tertiary Institutions Services Centre for Curtin University of Technology, Edith Cowan University, Murdoch University and The University of Western Australia.