Thebarton Senior College vs Underdale High School
A head-to-head comparison of two secondary schools in South Australia, 1.7 km apart, using official ACARA 2025 data. Best value in each row is highlighted.
Thebarton Senior College
Torrensville · Government high school · U, 11-12
1,284 students · ICSEA 951
Underdale High School
Underdale · Government high school · 7-12
629 students · ICSEA 1000
| Measure | Thebarton Senior College Torrensville SA | Underdale High School Underdale SA |
|---|---|---|
| Success Index | 37 Lower 50% | 46 Lower 50% |
| State rank (type) | #58 of 84 | #40 of 84 |
| National rank (type) | #1022 of 1,472 | #819 of 1,472 |
| Sector | Government | Government |
| Type | Secondary | Secondary |
| Year range | U, 11-12 | 7-12 |
| Students | 1,284 | 629 |
| Girls / boys | 725 / 559 | 274 / 355 |
| Foundation intake | – | – |
| Year 7 cohort | – | 68 |
| Year 12 cohort | 348 | 116 |
| VCE median study score VCAA, latest year | – | – |
| VCE study scores 40+ | – | – |
| 5-year enrolment growth | +18% | +15% |
| ICSEA Average 1000 | 951 | 1000 |
| ICSEA percentile | 25th | 47th |
| Top SEA quarter | 9% | 11% |
| Bottom SEA quarter | 57% | 36% |
| Students per teacher | 10.3 | 13.2 |
| Teaching staff (FTE) | 106.8 | 47.5 |
| Non-teaching staff (FTE) | 29.1 | 20.9 |
| Language background other than English | 72% | 42% |
| Indigenous students | 1% | 2% |
| Suburb | Torrensville 5031 | Underdale 5032 |
| Council area | West Torrens | West Torrens |
| Remoteness | Major Cities | Major Cities |
| Website | www.tsc.sa.edu.au | www.underdale.sa.edu.au |
The verdict
- •Underdale High School scores higher on the Success Index (46.2 vs 37.1).
- •Underdale High School has the higher ICSEA (1000 vs 951), indicating a more advantaged community.
- •Thebarton Senior College has fewer students per teacher (10.3 vs 13.2).
- •Thebarton Senior College is the larger school with 1,284 students compared with 629.
The Success Index summarises community advantage, resourcing and momentum from ACARA data. It does not measure teaching quality, results or fit. Methodology.
Free academic assessment
Torn between two schools? Start with your child.
Whichever you choose, a free Success Tutoring assessment shows exactly where your child is in English and Maths and how to get ahead before the next school year.
- Personalised learning plan mapped to the Australian Curriculum
- English & Maths from Kindergarten to Year 12
- Flexible memberships, no lock-in contracts
- Your nearest centre: Success Tutoring Windsor Gardens
Frequently asked questions
Is Thebarton Senior College better than Underdale High School?
On the Success Index, Underdale High School ranks higher (46.2 vs 37.1 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 Thebarton Senior College and Underdale High School?
About 1.7 km in a straight line, between Torrensville and Underdale in South Australia.
Which has the better student-to-teacher ratio?
Thebarton Senior College has 10.3 students per full-time-equivalent teacher and Underdale High School has 13.2.
How do Thebarton Senior College and Underdale High School rank in SA?
Thebarton Senior College is 58th of 84 and Underdale High School is 40th of 84 among secondary schools in South Australia on the 2025 Success Index.