Independent, co-ed K–12 school in Ultimo, NSW; 1224 students in a major city location.
NAPLAN well above the national average at every tested year level; the result is an A- overall.
International Grammar School is also known as IGS Ultimo and International Ultimo.
5 HSC Top Achievers — #34 of 240 New South Wales schools.
International Grammar School has an overall SchoolRank score of 73.4/100, rated "Good". This score is calculated from academic results, student growth, wellbeing, extracurricular programs, and value for money. Academically, the school scores 74/100, indicating strong performance relative to other Australian schools. The school's ICSEA (Index of Community Socio-Educational Advantage) is 1170, well above the national average of 1,000.
In 2025 NAPLAN testing at International Grammar School, Year 3 students averaged 462 across the tested NAPLAN domains, well above the national average of 407 for that year level, and Year 5 students averaged 549, well above the national average of 490 for that year level, and Year 7 students averaged 594, well above the national average of 540 for that year level, and Year 9 students averaged 615, well above the national average of 569 for that year level. Relative to national year-level averages, the school's strongest domain is Grammar. 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.
International Grammar School is a large independent combined school with approximately 1,224 students. It offers education for years K-12. As a independent school, enrolment typically involves an application process. Contact the school directly for enrolment criteria, waiting lists, and open day information.
International Grammar School has a student-to-teacher ratio of 9.7:1. This is well below the national average of approximately 14:1, meaning students generally receive more individual attention. Support staff make up 30% of the workforce, providing additional learning assistance and pastoral care. The student attendance rate is 94%, which is strong.
The Year 12 completion rate is 100%.
International Grammar School is located in Ultimo, NSW, classified as a major cities school. With an ICSEA of 1170 (98th 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.