Australia operates a federalised education system: each of the eight states and territories sets its own Year 11-12 curriculum and senior secondary certificate, but they're all anchored to the Australian Curriculum (ACARA) at Foundation-Year 10. The Australian Curriculum is overseen by the Australian Curriculum, Assessment and Reporting Authority and applied with state variations.
The four most internationally significant Year 12 certificates are: HSC (NSW Higher School Certificate), VCE (Victorian Certificate of Education), WACE (Western Australian Certificate of Education), and QCE (Queensland Certificate of Education). Most international Australian schools follow NSW (HSC) or Victoria (VCE), since these are the largest state systems and best understood by international university admissions.
All Year 12 certificates feed into a single university admissions metric: the ATAR (Australian Tertiary Admission Rank), a percentile rank from 0.00 to 99.95. ATAR is calculated by scaling a student's best 4-5 Year 12 subjects against the cohort and converting to a percentile. ATAR 99+ means top 1% of Year 12 nationally. Australian universities. Sydney, Melbourne, ANU, UQ, Monash, UNSW. use ATAR as the primary admissions metric.
Internationally, Australian-curriculum schools are concentrated in South East Asia (Malaysia, Indonesia, Vietnam, Thailand) and the Pacific. Australian International School Malaysia (AISM), Australian Independent School Jakarta (AIS), Australian International School Saigon (AIS), and AISM Singapore are among the largest. Many bilingual schools globally also offer Australian curriculum streams alongside local or IB pathways.