Glenunga International High School vs Seymour College
A head-to-head comparison of two schools in South Australia, 1.2 km apart, using official ACARA 2025 data. Best value in each row is highlighted.
Glenunga International High School
Glenunga · Government high school · 7-12
2,340 students · ICSEA 1153
Seymour College
Glen Osmond · Independent combined · R-12
715 students · ICSEA 1150
| Measure | Glenunga International High School Glenunga SA | Seymour College Glen Osmond SA |
|---|---|---|
| Success Index | 81 Top 5% | 76 Top 25% |
| State rank (type) | #3 of 84 | #12 of 145 |
| National rank (type) | #56 of 1,472 | #165 of 1,259 |
| Sector | Government | Independent |
| Type | Secondary | Combined |
| Year range | 7-12 | R-12 |
| Students | 2,340 | 715 |
| Girls / boys | 1,085 / 1,255 | 715 / 0 |
| Foundation intake | – | 25 |
| Year 7 cohort | 407 | 51 |
| Year 12 cohort | 379 | 98 |
| VCE median study score VCAA, latest year | – | – |
| VCE study scores 40+ | – | – |
| 5-year enrolment growth | +27% | -4% |
| ICSEA Average 1000 | 1153 | 1150 |
| ICSEA percentile | 96th | 95th |
| Top SEA quarter | 60% | 61% |
| Bottom SEA quarter | 2% | 4% |
| Students per teacher | 14.9 | 10.8 |
| Teaching staff (FTE) | 157.2 | 66.3 |
| Non-teaching staff (FTE) | 43.7 | 52.4 |
| Language background other than English | 67% | 14% |
| Indigenous students | 1% | 2% |
| Suburb | Glenunga 5064 | Glen Osmond 5064 |
| Council area | Burnside | Burnside |
| Remoteness | Major Cities | Major Cities |
| Website | www.gihs.sa.edu.au | www.seymour.sa.edu.au |
The verdict
- •Glenunga International High School scores higher on the Success Index (80.9 vs 76.2).
- •Glenunga International High School has the higher ICSEA (1153 vs 1150), indicating a more advantaged community.
- •Seymour College has fewer students per teacher (10.8 vs 14.9).
- •Glenunga International High School is the larger school with 2,340 students compared with 715.
- •Glenunga International High School has grown faster over five years (27% vs -4%).
- •Glenunga International High School is a government school while Seymour College is an independent school, so fees and enrolment rules differ.
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 Glenunga International High School better than Seymour College?
On the Success Index, Glenunga International High School ranks higher (80.9 vs 76.2 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 Glenunga International High School and Seymour College?
About 1.2 km in a straight line, between Glenunga and Glen Osmond in South Australia.
Which has the better student-to-teacher ratio?
Glenunga International High School has 14.9 students per full-time-equivalent teacher and Seymour College has 10.8.
How do Glenunga International High School and Seymour College rank in SA?
Glenunga International High School is 3rd of 84 and Seymour College is 12th of 145 among secondary schools in South Australia on the 2025 Success Index.