CatholicCombinedYears K-12· Major Cities

St Mary's Cathedral College

Sydney, NSW 2000 · Catholic Schools NSW

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ICSEA

1125

90th percentile nationally

Elite (top decile)

Total enrolments

937

Combined

Student–teacher ratio

13:1

72.3 FTE teachers

Gender mix

14% / 86%

girls / boys

Language background

61%

non-English at home

Socio-educational advantage

Share of students in each national SEA quarter (bottom = most disadvantaged, top = most advantaged).

Bottom: 4%

Lower-mid: 15%

Upper-mid: 32%

Top: 49%

Explore Sydney, NSWLiveability 58

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Source: ACARA My School 2025. ICSEA reflects the socio-educational background of a school's students — not academic results or teaching quality. National average = 1000. See data sources.