You can accept as many offers that interest you. You are only committed to a course once you have enrolled for it.
See UAC's flowchart here.
Apply through UAC or directly through individual institution. Click here for more information
(EAS) These schemes aim to help students, whose education has been negatively affected during Year 11 and/or Year 12 (or equivalent), receive an offer to university.
To apply for these schemes, students are required to apply directly to each individual university.
https://www.uac.edu.au/future-applicants/scholarships-and-schemes/educational-access-schemes
UNSW Elite Athlete, Performers, Leaders Adjustment Factors EAPL
University of Sydney Elite Athletes and Performers. See here Open in August, close 29 October 2021
UTS Elite Athlete and Performer Scheme. See here
SRS Institutions will assess student applications using criteria other than ATAR. Apply through UAC.