International School of Western Australia vs St Mary's Anglican Girls' School
A head-to-head comparison of two combined schools in Western Australia, 2.6 km apart, using official ACARA 2025 data. Best value in each row is highlighted.
International School of Western Australia
City Beach · Independent combined · PP-12
396 students · ICSEA 1180
St Mary's Anglican Girls' School
Karrinyup · Independent combined · PP-12
1,483 students · ICSEA 1151
| Measure | International School of Western Australia City Beach WA | St Mary's Anglican Girls' School Karrinyup WA |
|---|---|---|
| Success Index | 90 Top 5% | 77 Top 25% |
| State rank (type) | #2 of 172 | #13 of 172 |
| National rank (type) | #8 of 1,259 | #152 of 1,259 |
| Sector | Independent | Independent |
| Type | Combined | Combined |
| Year range | PP-12 | PP-12 |
| Students | 396 | 1,483 |
| Girls / boys | 189 / 207 | 1,483 / 0 |
| Foundation intake | 23 | 40 |
| Year 7 cohort | 40 | 185 |
| Year 12 cohort | 35 | 170 |
| VCE median study score VCAA, latest year | – | – |
| VCE study scores 40+ | – | – |
| 5-year enrolment growth | +32% | +3% |
| ICSEA Average 1000 | 1180 | 1151 |
| ICSEA percentile | 98th | 95th |
| Top SEA quarter | 78% | 61% |
| Bottom SEA quarter | 0% | 2% |
| Students per teacher | 8.4 | 9.1 |
| Teaching staff (FTE) | 47.3 | 162.3 |
| Non-teaching staff (FTE) | 16.5 | 84.5 |
| Language background other than English | 43% | 19% |
| Indigenous students | 0% | 2% |
| Suburb | City Beach 6015 | Karrinyup 6018 |
| Council area | Stirling | Stirling |
| Remoteness | Major Cities | Major Cities |
| Website | www.iswa.wa.edu.au | www.stmarys.wa.edu.au |
The verdict
- •International School of Western Australia scores higher on the Success Index (89.7 vs 77.2).
- •International School of Western Australia has the higher ICSEA (1180 vs 1151), indicating a more advantaged community.
- •International School of Western Australia has fewer students per teacher (8.4 vs 9.1).
- •St Mary's Anglican Girls' School is the larger school with 1,483 students compared with 396.
- •International School of Western Australia has grown faster over five years (32% vs 3%).
The Success Index summarises community advantage, resourcing and momentum from ACARA data. It does not measure teaching quality, results or fit. Methodology.
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Frequently asked questions
Is International School of Western Australia better than St Mary's Anglican Girls' School?
On the Success Index, International School of Western Australia ranks higher (89.7 vs 77.2 out of 100). The index measures community advantage and momentum from ACARA data, not teaching quality, so visit both schools before deciding.
How far apart are International School of Western Australia and St Mary's Anglican Girls' School?
About 2.6 km in a straight line, between City Beach and Karrinyup in Western Australia.
Which has the better student-to-teacher ratio?
International School of Western Australia has 8.4 students per full-time-equivalent teacher and St Mary's Anglican Girls' School has 9.1.
How do International School of Western Australia and St Mary's Anglican Girls' School rank in WA?
International School of Western Australia is 2nd of 172 and St Mary's Anglican Girls' School is 13th of 172 among combined schools in Western Australia on the 2025 Success Index.