It is an annual, 14 round competition played between 8 Sydney member teams that include Saint Ignatius Riverview, St Joseph's Hunters Hill, Sydney Grammar, Sydney Boys High, Newington College, Scots College, The Kings school and Sydney Church Of England Grammar School (Shore).
Preseason games are played in Term 3-4 school holidays in the Knox Invitational tournament and Raschke Cup as well as the Trinity Challenge in Summer, with the official GPS games played in Term 4 and 1 on Saturday.
In near consecutive seasons of 2013, 2014, 2015, 2017, 2018 Saint Ignatius College Riverview have made the final, in which they have been victorious 4 times (13, 15, 17, 18).
The season begins in Term 4, where teams will play trial matches against a mix of AAGPS, ISA, and CAS teams, including 3 rounds of Raschke Cup/Yeend Shield, where a pre-season winner will be crowned.
Term 1 begins the competition games where schools play each other every Saturday, 10am for 2nd V and 11:45am for 1st V. If a team is able to win 7 games they will be crowned Undefeated Champions and earn the outright AAGPS title.