The Young Flute Player by Karen North
Piano accompaniments and flute duet parts for most of the pieces in Book 1 and Book 2 can be found here.
AMEB Flute Series 3 Exam Books
Preliminary to Third Grade
Recorded Accompaniments as Digital Downloads
Recorded Accompaniments on YouTube
Digital downloads of individual pieces or the entire Exam Book are also available from major digital music outlets like iTunes, Google Play and Spotify (Search for the composer and title of your piece.)
Then download the MyTempo app ($4.49) for your Apple or Android smartphone or tablet. This app allows you to speed up, slow down and loop any digital download, so you can practise with the accompaniment at any speed you choose.
Other Useful Sites
All of these sites have accompaniments for some of the higher grade AMEB Flute repertoire.
Cadenza Live app (for iPhone and iPad)
Flute Orchestral Backings and Piano Accompaniments