For both Track and Field and Cross Country, selection for the Victorian team is through Athletics Victoria.
For Track and Field, Athletics Victoria enters a team at the Australian All Schools Track & Field Championships. Selection for this team is via Athletics Victoria's Victorian All School Track & Field Championships.
https://athsvic.org.au/events/victorian-all-school-track-field-championships/
For Cross Country, Athletics Victoria enters a team at the Australian Cross Country Championships. Selection for this team is via Athletics Victoria's Victorian All School Cross Country Championships.