Great Southern Grammar School is a co-ed independent school set on a waterfront campus in Kalgan, serving regional families through its boarding provision.
NAPLAN in line with national year-level averages; the result is a B+ overall.
Great Southern Grammar School is a co-ed independent school set on a waterfront campus in Kalgan, serving regional families through its boarding provision. The school builds its learning around outdoor education and expeditions, complemented by a strong arts programme and sports offering. With individualised learning support and a notably pastoral approach, it creates a tight-knit community where experiential, hands-on learning is central to how students engage with the world.
Great Southern Grammar School is also known as GSGS and GSGS Kalgan.
Great Southern Grammar School has an overall SchoolRank score of 60.1/100, rated "Good". This score is calculated from academic results, student growth, wellbeing, extracurricular programs, and value for money. Academically, the school scores 58/100, indicating moderate performance relative to other Australian schools. The school's ICSEA (Index of Community Socio-Educational Advantage) is 1080, well above the national average of 1,000.
In 2025 NAPLAN testing at Great Southern Grammar School, Year 3 students averaged 398 across the tested NAPLAN domains, in line with the national average of 407 for that year level, and Year 5 students averaged 488, in line with the national average of 490 for that year level, and Year 7 students averaged 564, above the national average of 540 for that year level, and Year 9 students averaged 590, above the national average of 569 for that year level. Relative to national year-level averages, the school's strongest domain is Reading. National averages are specific to each year level, because NAPLAN scores are scaled so older year levels score higher, a school-wide average can't be compared with a single national figure.
Great Southern Grammar School is a medium-sized independent combined school with approximately 611 students. It offers education for years PP-12. As a independent school, enrolment typically involves an application process. Contact the school directly for enrolment criteria, waiting lists, and open day information.
Great Southern Grammar School has a student-to-teacher ratio of 11.2:1. This is below the national average of approximately 14:1, meaning students generally receive more individual attention. Support staff make up 42% of the workforce, providing additional learning assistance and pastoral care. The student attendance rate is 91%, which is moderate.
Great Southern Grammar School is located in Kalgan, WA, classified as a outer regional school. With an ICSEA of 1080 (78th percentile), the school community's socio-educational advantage is above average, families tend to have higher education and income levels. ICSEA measures the educational advantage of a school's community, not the school's quality, a lower ICSEA school with strong academic scores may indicate particularly effective teaching.