ISS International School Singapore

Founded in 1981 by visionary politician Chan Chee Seng, ISS International School operates from a serene heritage campus at Preston Road in the Alexandra area. The school delivers all three IB programmes - Primary Years Programme, Middle Years Programme, and Diploma Programme - alongside its own High School Diploma option for students aged 4-19. With only 250 students across all year levels, ISS maintains an intimate educational environment that contrasts sharply with Singapore's larger international schools like Singapore American School's 4,000-student enrollment.

The school's defining characteristic is its 'Kampong Spirit' philosophy, which emphasizes community, togetherness, and respect within a close-knit environment. This cultural approach supports personalized learning through small class sizes and extensive English as an Additional Language programming for international families. The Preston Road campus features two libraries, gymnasiums, art and drama studios, science laboratories, and basketball courts, all designed to support the school's focus on character development and service-learning alongside academic achievement.

Strengths

• Complete IB continuum from preschool through Grade 12
• Small school environment with only 250 students enabling personalized attention
• Strong English as an Additional Language support for international families
• Heritage campus location in peaceful Alexandra area
• Distinctive 'Kampong Spirit' community culture
• One of Singapore's longest-established IB schools since 1981
• Dual diploma options with IB and school's own High School Diploma

Considerations

• Very small student body may limit extracurricular variety and peer group options
• Fees range from SGD 25,000 to SGD 54,430 annually
• Limited public information about specific academic outcomes or university placement rates
• Smaller facilities compared to Singapore's larger international schools
• May lack the extensive resources and programs available at larger institutions

Academics

For the Class of 2025, ISS reported a highest IB score of 43 points, a 94% IB Diploma pass rate, and an 88% Bilingual Diploma rate. The High School Diploma (HSD) pass rate was 100%. In the May 2025 MYP e-assessments, the school achieved a 100% pass rate with an average score of 38 points and a top score of 45.

School life

Sports offered include basketball, volleyball, football, table tennis, badminton, taekwondo, ultimate frisbee, and dance. Competitive teams participate in the Athletic Conference of Singapore International Schools (ACSIS) league. Arts and music programs include an annual theatrical production, DJ programme, and music showcases.

The campus is located on a hilltop heritage site of approximately 64,000 square feet. Facilities include science labs, libraries, music rooms, art studios, a black box theatre, a multi-purpose room, and a sports court. There is no swimming pool or large playing fields on campus; PE and swim classes are conducted off-campus at nearby complexes.

Student body

Total enrolment is less than 700 students (all-through K-12, ages 4-18). The community represents over 30 countries (other reports indicate up to 59 nationalities) with a 30% cap on any single nationality to maintain diversity. The student-teacher ratio is 1:8, and the average class size ranges from 15 to 20 students.

<a href="/international-schools/singapore/iss-international-school">ISS International School Singapore</a> is widely characterised as a small, community-led IB school rather than a large-campus operator. Recent, independent commentary points to a warm culture and close relationships, with recurring caveats about modest facilities and the realities of being a smaller, not-for-profit school.

What parents consistently praise

A February 2026 review byemphasises ISS's "kampong spirit", small classes and a through-train IB continuum, describing a village-style feel on a hilltop site. A June 2024 parent feature on <a href="https://honeykidsasia.com/iss-family-review-agartson/">HoneyKids Asia</a> similarly highlights staff who made families feel at home quickly, with teachers seen as accessible and attentive.

Where the criticism lands

The samepiece notes that first impressions can read as dated or rundown, and that the steep, heritage-heavy site is not purpose-built. A June 2025 thread on <a href="https://www.reddit.com/r/Internationalteachers/comments/1l1cesp/iss_international_school_singapore/">Reddit</a> discusses pressures linked to limited resources and lower pay in a not-for-profit setting, and claims the move to a smaller, older campus reduced its standing among Singapore's long-established schools.

Admissions

Independent sources do not point to a single admissions bottleneck, but do frame ISS as a small school where fit matters. Prospective families should look closely at the campus environment and ask how language support is delivered in practice, given references to a substantial EAL population and a strong EAL programme.