Small independent co-ed primary (K–6) in Balmain, NSW; 95 students total.
NAPLAN cohorts too small to compare with national averages; the result is an A- overall.
Inner Sydney Montessori School is also known as ISMS and ISMS Balmain.
Inner Sydney Montessori School has an overall SchoolRank score of 73.4/100, rated "Excellent". This score is calculated from academic results, student growth, wellbeing, programs, and value for money. Academically, the school grades A− (Excellent) against other Australian schools. The school's ICSEA (Index of Community Socio-Educational Advantage) is 1178 (98th percentile; the national average is 1,000).
Inner Sydney Montessori School has about 95 students across 7 year levels, so roughly 14 sit each year level's NAPLAN test. That is too few to compare meaningfully with a national average: a handful of children moves the figure by more than most real differences between schools. Its most recent published results are from 2025. Year 3 students averaged Reading 466, Writing 437, Numeracy 444, Spelling 476 and Grammar 486. Year 5 students averaged Reading 541, Writing 518, Numeracy 537, Spelling 525 and Grammar 523. Year levels are listed separately because NAPLAN scores rise with year level. Students at Inner Sydney Montessori School sit NAPLAN in Years 3 and 5.
Inner Sydney Montessori School is a very small Independent primary school with approximately 95 students. It offers education for years K-6. As an Independent school, enrolment typically involves an application process. Contact the school directly for enrolment criteria, waiting lists, and open day information.
Inner Sydney Montessori School has approximate annual tuition fees of $19,836. Actual fees may vary by year level, and additional costs for uniforms, camps, and extracurricular activities typically apply. The school grades B (Average) for value for money, which weighs academic results against the cost of attendance.
Inner Sydney Montessori School has a student-to-teacher ratio of 6.4:1. This is well below the national average of approximately 14:1, meaning students generally receive more individual attention. Support staff make up 61% of the workforce, providing additional learning assistance and pastoral care. The student attendance rate is 89%, which is good.
Inner Sydney Montessori School is located in Balmain, NSW, in a major city. Its ICSEA is 1178 (98th percentile; the national average is 1,000). ICSEA measures the advantage of a school's community, from its parents' education and occupation, not the school's quality. A school with a lower ICSEA and strong academic results may be teaching particularly effectively.