If you are in Year 11 or 12, you can apply for a scholarship through the Scholarships for Australian-German Students Exchange (SAGSE) to spend 10-weeks going to school and living with a family in Germany. And/or you could host a student from Germany when you are in Year 10, 11 or 12. NB: This program operates when international travel is permitted.
SAGSE scholarships have been offered through the generosity of German and Australian companies since 1967. The AGTV as an association has funded a scholarship since 1979.