It looks like George left UK after his father's death in 1890. Given this was a family who I don't believe would have worked in the ordinary sense it makes good sense that George would have attended a place that would equip him for a life in Australia. I did locate a dissolution of partnership for a property where he was listed as grazier so it appears he put his new found skills to work albeit they may not have worked too well.
There's another Fulwar CRAVEN, a grazier, dissolving a partnership, however, cannot be your chap, as he was still a child. The property was in The Clarence District of NSW.
http://trove.nla.gov.au/ndp/del/article/82110155 Warwick Examiner and Times, 16 July 1881.
May I gently again suggest that the Queensland marriage cert will contain information provided by your chap, and he was required to give info about his parents, and about himself, including where he was born.
The AIF project originally accepted submissions from the general public, and was not funded to validate the submissions. It also has entries based on the WWI nominal roll, and the CWGC info. and some Red Cross records. It also has the following statement :
https://www.aif.adfa.edu.au/disclaimer.html " The personal dossiers of individual members, now held by the National Archives of Australia, Canberra Office, are the authoritative record for details of military service. Medal entitlements are recorded on each dossier."
Several of my ancestors WWI details at the AIF project's index contain info that does not match up with their AIF files at the NAA, nor with private family papers, nor with WWI nominal Roll, nor the CWGC.
Cheers, JM