Thornlie Senior High School
Updated Oct 2026 · ACARA 2025Thornlie, Western Australia 6108 · Gosnells LGA
About Thornlie Senior High School
Thornlie Senior High School is a public high school located in Thornlie, Western Australia (6108), within the Gosnells local government area. It caters for students from 7 to 12 and in 2025 enrolled 1,125 students (538 girls and 587 boys).
Thornlie Senior High School has an ICSEA value of 969, indicating a socio-educational profile close to the national average of 1000. That places it in the 33rd percentile of Australian schools. 6% of students come from the top socio-educational quarter and 47% from the bottom quarter.
The school employs 88 teachers (81.5 full-time equivalent) and 39 non-teaching staff, giving a student-to-teacher ratio of about 13.8 to 1. Enrolments have fallen by 3% over the past five years.
On the Success Index, Thornlie Senior High School scores 31.7 out of 100, placing it in the lower 50% of secondary schools nationally and 99th of 140 secondary schools in WA (3rd of 5 in the Gosnells area).
Year 12 ATAR results (2025)
The School Curriculum and Standards Authority lists, for every ATAR course, the schools whose students had combined scores in the top 15% of that course. Thornlie Senior High School appears for 1 course.
Courses
Health Studies
WA does not publish median ATARs by school; this list is the official per-school measure of top-end achievement. See WA schools with the most top-performing ATAR students.
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 969
- Students in the top advantage quarter (15%)6% of students
- Teacher resourcing (students per teacher) (15%)13.8 students per teacher
- Enrolment growth vs local area (5 years) (10%)-3% enrolments since 2020 (area median +4%)
- ICSEA trend (5 years) (10%)-3 ICSEA points since 2020
The Success Index summarises the academic environment of a school community using official ACARA data. It is not a measure of teaching quality or student results. Read the methodology.
Student profile
Distribution of students across socio-educational advantage (SEA) quarters, plus community characteristics.
Enrolments by year level
How Thornlie Senior High School's 1,125 students are spread across year levels in 2025.
Enrolment trend
How enrolments at Thornlie Senior High School have changed over the past decade.
Free academic assessment
Is your child on track at Thornlie Senior High School?
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Schools near Thornlie Senior High School
Closest schools by straight-line distance, with their Success Index.
South Thornlie Primary School
Thornlie · Government primary · K-6
421 students · ICSEA 997 · 182 m away
Sacred Heart Primary School
Thornlie · Catholic primary · PP-6
387 students · ICSEA 1050 · 416 m away
Australian Islamic College (Thornlie)
Thornlie · Independent combined · PP-6
733 students · ICSEA 1019 · 1.3 km away
Thornlie Primary School
Thornlie · Government primary · K-6
470 students · ICSEA 941 · 1.4 km away
Forest Crescent Primary School
Thornlie · Government primary · K-6
627 students · ICSEA 1011 · 1.6 km away
Yale Primary School
Thornlie · Government primary · K-6
398 students · ICSEA 969 · 1.8 km away
Huntingdale Primary School
Huntingdale · Government primary · K-6
439 students · ICSEA 956 · 1.8 km away
Wirrabirra Primary School
Gosnells · Government primary · K-6
366 students · ICSEA 923 · 2.1 km away
Wirrabirra Education Support Centre
Gosnells · Government special · K-6
67 students · ICSEA 965 · 2.1 km away
Excelsior Primary School
Canning Vale · Government primary · K-6
330 students · ICSEA 1060 · 2.4 km away
Similar schools
Government secondary schools in WA with a comparable ICSEA.
Ellenbrook Secondary College
Ellenbrook · Government high school · 7-12
1,442 students · ICSEA 968
Dalyellup College
Dalyellup · Government high school · 7-12
576 students · ICSEA 970
Yanchep Secondary College
Yanchep · Government high school · 7-12
854 students · ICSEA 970
Byford Secondary College
Byford · Government high school · 7-12
1,419 students · ICSEA 971
Safety Bay Senior High School
Safety Bay · Government high school · 7-12
1,148 students · ICSEA 966
John Tonkin College
Mandurah · Government high school · 7-12
799 students · ICSEA 972
Frequently asked questions
Is Thornlie Senior High School a public or private school?
Thornlie Senior High School is a public (government) school run by the Western Australia education department.
What year levels does Thornlie Senior High School offer?
Thornlie Senior High School offers 7 to 12. It is classified by ACARA as a secondary school.
How many students attend Thornlie Senior High School?
In 2025, Thornlie Senior High School had 1,125 enrolled students (538 girls, 587 boys), a change of -3% over five years.
What is the ICSEA of Thornlie Senior High School?
Thornlie Senior High School has an ICSEA (Index of Community Socio-Educational Advantage) of 969. The national average is 1000, so this indicates a socio-educational profile close to the national average of 1000. ICSEA reflects the school community, not teaching quality.
How does Thornlie Senior High School rank in WA?
Thornlie Senior High School ranks 99th of 140 secondary schools in Western Australia on the Success Index (31.7/100), and 1140th of 1,472 nationally.
What is the student-to-teacher ratio at Thornlie Senior High School?
Thornlie Senior High School has about 13.8 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How big is the Year 7 cohort at Thornlie Senior High School?
In 2025, Thornlie Senior High School had 200 students in Year 7 and 151 in Year 12.
Is Thornlie Senior High School co-ed?
Yes. Thornlie Senior High School is a co-educational school enrolling both girls and boys.
What other schools are near Thornlie Senior High School?
There are 10 other schools within 15 km of Thornlie Senior High School in our database. Scroll up to the "Nearby schools" section to compare them by Success Index, ICSEA and enrolments, or use the Compare tool.
Where can I get tutoring near Thornlie Senior High School?
The closest Success Tutoring centre is Success Tutoring Canning Vale, about 3.7 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.