Off the top of my head, only three Sydney GPS players in the squad: Kurtley Beale (Joeys), Dean Mumm (Kings), Nick Phipps (Kings).
Hookers
Stephen Moore - Brisbane Grammar School - QLD GPS
Tatafu Polota-Nau - Granville South High School - NSW CHS - 2002/03 Schoolboy
James Hanson St Joseph's Gregory Terrace - QLD GPS - 2005 Schoolboy
Props
Greg Holmes - Downlands College - QLD
Sekope Kepu - Wesley College - NZ
Scott Sio - Trinity Grammar School - NSW CAS - 2009 Schoolboy
James Slipper - The Southport School - QLD GPS - 2005 Schoolboy
Toby Smith - Hamilton Boys' High School - NZ
Locks
Kane Douglas - Maclean High School - NSW CHS
Dean Mumm - The Kings School - AAGPS - 2002 Schoolboy
Rob Simmons - The Southport School - QLD GPS - 2006 Schoolboy
Will Skelton - Hills Sports High School - NSW CHS
Sam Carter - The Scots College - AAGPS
Backrow forwards
Scott Fardy - Barrenjoey High School - NSW CHS
Michael Hooper - St Pius X College - NSW ISA - 2008 Schoolboy A
Ben McCalman - Kinross Wolaroi School - NSW ISA - 2006 Schoolboy
Sean McMahon - St Joseph's College, Nudgee - QLD GPS - 2011 Schoolboy
Wycliff Palu - Balgowlah Boys High School - NSW CHS
David Pocock - Anglican Church Grammar School - QLD GPS - 2005 Schoolboy
Scrumhalves
Will Genia - Brisbane Boys' College - QLD GPS - 2005 Schoolboy A
Nick Phipps - The Kings School - AAGPS
Flyhalves
Quade Cooper - Anglican Church Grammar School - QLD GPS - 2005/6 Schoolboy
Bernard Foley - St Aloysius College - NSW CAS
Inside backs
Kurtley Beale - St Joseph's College Hunters Hill - AAGPS- 2005/6 Schoolboy
Matt Giteau - St Edmunds College, Canberra - ACTJRU - 2000 Schoolboy A
Matt To'omua - Brisbane State High School - QLD GPS - 2007 Schoolboy
Outside backs
Adam Ashley-Cooper - Berkeley Vale High School - NSW CHS
Israel Folau - Marsden State High School - QLD CSS - 2006 Mungo Schoolboy
Rob Horne - Georges River College - NSW CHS - 2006/7 Schoolboy
Drew Mitchell - St Patrick's College, Shorncliffe - QLD AIC - 2001 Schoolboy
Henry Speight - Hamilton Boys High School - NZ
Joe Tomane - St Joseph's College, Nudgee - QLD GPS - 2007 Schoolboy
Tevita Kuridrani - Corinda State High School - QLD CSS
Also at RWC15 for other countries
Fiji - Ben Volavola - Newington College - AAGPS
Fiji - Nemani Nadolo - St Joseph's College, Nudgee - QLD GPS (as Ratu Nasiganiyavi)
Japan - Craig Wing - Sydney Boys’ High School - AAGPS - 1997 Schoolboy
NSW CHS - 7
NSW AAGPS - 4 (+ 2 Other Nations)
NSW CAS - 2
NSW ISA – 2
QLD GPS - 10 (+ 1 Other Nations)
QLD CSS - 2
QLD Other - 1
QLD AIC- 1
ACT JRU- 1
NZ - 3
Private Schools - 21 (+2)
Public Schools - 12 (+1)
NSW - 15 (+2)
QLD - 14 (+1)
ACT - 1
NZ - 3
Former Aust Schoolboys - 15 (+1 Mungo) (+ 1 Other Nations)
Former Aust Schoolboys A - 3
Not ASRU Rep - 11 (+ 2 ON)
Not NZ Schoolboys Rep - 3