When you are so into learning language, taking exam can become fun thing to do to prove your effort on paper as a gift to yourself.
In Brisbane, you can take Japanese Language Proficiency Test annually. About JLPT: https://www.jlpt.jp/e/
JLPT in Brisbane: December 2023.
Application period is August 24 (Thu) 9am AEST to September 7 (Thu) 5pm AEST or until capacity is reached, so you better make sure to book earlier.
Register online via: https://jpf.org.au/language/for-learners/jlpt/
You can follow the details from JLPT Brisbane
がんばってね！Go for it!