Applications for interstate study are processed through state-based tertiary admissions centres. You should contact the appropriate tertiary admissions centre depending on the state in which you wish to study:
In terms of prioritising applicants, if you are applying to interstate courses with selection based on academic merit, your ATAR will be used interstate, meaning that prioritising students probably isn't something that applies. All ATARs are treated as equivalent between the states, which makes applying interstate easier.
I will also include a couple of websites that you can use to learn more about different degrees offered by different Australian institutions:
- Course Seeker: This website provides you with access to details of all undergraduate courses offered by Australian higher education institutions. (https://www.courseseeker.edu.au/)
- ComparED: This website helps you compare student and graduate experiences across Australian higher education institutions. (https://www.compared.edu.au/)
I hope this helps!