Curtin University is located in South-east Perth in Western Australia. The nearest international schools (geographically) that cater for boys aged 6 are Wesley College (co-ed junior school), Rehoboth Christian College (co-ed), Ursula Frayne Catholic College (co-ed) and Riverside Community School (co-ed).
This link will provide you with a list of all the schools in Central Perth that cater for international students:
http://www.privateschoolsguide.com/perth-central-private-schools?cb_cricosregistered[0]=Yes&cb_religiousaf=&cb_years=&cbsecuritym3=cbm_5e3e559d_34f5c268_31dfccd44bb3e27bde0053597c0ff12f&name=&search=
This link will provide you with a list of all the schools in Perth South that cater for international students:
http://www.privateschoolsguide.com/perth-central-private-schools?cb_cricosregistered[0]=Yes&cb_religiousaf=&cb_years=&cbsecuritym3=cbm_5e3e559d_34f5c268_31dfccd44bb3e27bde0053597c0ff12f&name=&search=
Or, the link below displays every non-government international school in Australia on a map and allows you to easily search for schools within a desired readius of Perth or any other specific location.