If you are considering studying at ANU next year or beyond, you need to read the new admission criteria.
Basically they are only using ATAR as one admission criteria amongst a number of other criteria (Service and Co-curricula).
This is a major deviation from the UAC process from previous years. It only affects those students who are considering studying at ANU.
Applications for students starting in Semester 1 2020 open on 4 March 2019 and close on 31 May 2019.
Check out the website below for more details.