ISS International School vs Overseas Family School
🇸🇬 Singapore · Side-by-side comparison on verifiable public data.
Neither ISS International School nor Overseas Family School sits in a market with a public inspectorate, so both are assessed on verifiable accreditation, curriculum authorisation, and published data rather than an official quality rating. Curriculum is the core differentiator: ISS International School offers IB, American while Overseas Family School offers IB, British — the choice should follow the family's target qualification system. Both are day schools with fees in the same market band — see the table below for the figures, and verify against each school's own published fees.
Key Facts
| ISS International School | Overseas Family School | |
|---|---|---|
| Curriculum | IB / American | IB / British |
| Ages | 4–18 | 2–18 |
| Languages of instruction | English | English |
| Annual fees | SGD 25,000–54,430 | SGD 28,400–44,800 |
| Enrollment | — | 3,000 |
| Boarding | Day only | Day only |
| Accreditations | CIS, WASC, EARCOS, EduTrust, EAPISA | WASC, Cambridge International, IB, EduTrust |
Strengths
- ✓Full IB continuum (PYP + MYP + DP) under one roof — uncommon and verifiable
- ✓Long track record: established 1981, one of Singapore's older international schools
- ✓Strong, layered accreditation for a small school: WASC (1986), CIS (2011), EduTrust 4-year certificate (2023–2027)
- ✓Dual senior pathway — IB Diploma plus an American-style High School Diploma
- ✓Explicit EAL / multilingual-learner support and a Bilingual Diploma option
- ✓Strong, structured English-language support via the Study Preparation Program (SPP), offered at no extra fee
- ✓Mother Tongue Program offered at no additional cost, supporting first-language retention
- ✓Open-entry admissions: no entrance exams, no English-proficiency requirement, year-round enrollment with pro-rated fees
- ✓Comparatively accessible fees for Singapore: SGD 28,400–44,800/year (2025/26), below many premium peers
- ✓Large, established institution (founded 1991, ~3,000 students, ~70 nationalities) on a single 110,000 sqm campus
Trade-offs
- !Small scale typically means fewer specialist facilities, sports teams and CCA breadth than large campuses (ISS joined EAPISA, an association for small international schools)
- !No published total enrollment figure, limiting transparency on cohort size
- !Fees are mid-to-high (senior grades exceed SGD 50,000/year before development and protection-scheme fees), without the facilities footprint of similarly-priced larger schools
- !No independent inspectorate rating published (EduTrust is a regulatory certification, not a graded inspection)
- !Published IB results (top score 43; 94% diploma rate) are school-reported and not independently verified
- !Very large student body (~3,000) on one campus may mean less individual attention
- !Open-entry, no-exam admissions with broad EAL intake produces a wide ability and language range within classes
- !Single Pasir Ris campus — no choice of location and a longer commute for families in western/central Singapore
- !IB PYP is not offered (IPC used at primary), so families wanting the full IB continuum from kindergarten will not find it here
- !No published IB Diploma average or IGCSE result figures were publicly retrievable
Best Fit For
- • Families wanting the full IB continuum (PYP→MYP→DP) with continuity across all stages
- • Students who thrive in small classes with close teacher attention and mentorship
- • Internationally mobile / expat families needing strong EAL support and a Bilingual Diploma route
- • Families wanting an IBDP alternative (the American-style High School Diploma) within the same school
- • Internationally mobile families arriving mid-year or needing immediate placement (year-round, pro-rated enrollment)
- • Students who need substantial English-language support (SPP) or who are new to English-medium education
- • Families wanting mother-tongue language retention alongside an English curriculum
- • Cost-conscious expatriate families seeking an established IB/IGCSE school at relatively accessible fees
University Placement
School-reported · not independently verified
School-reported, unverified: ISS publishes a highest IB score of 43, a 94% IB Diploma attainment rate, an 88% Bilingual Diploma rate and a 100% HSD pass rate (2024–25). No independently published IB average or university-placement list was found.
School-reported, unverified: OFS references 'Outstanding IB Results 2025!' on its website but publishes no numerical IB Diploma average or university-placement data. No A-Level or IGCSE result figures were publicly retrievable.
More Comparisons
Frequently Asked Questions
Should I choose ISS International School or Overseas Family School?
ISS International School is best for: Families wanting the full IB continuum (PYP→MYP→DP) with continuity across all stages. Overseas Family School is best for: Internationally mobile families arriving mid-year or needing immediate placement (year-round, pro-rated enrollment). The right choice depends on target curriculum, budget, and family priorities — the two are not linearly comparable.
How do fees compare between ISS International School and Overseas Family School?
ISS International School: SGD 25,000–54,430. Overseas Family School: SGD 28,400–44,800. Verify against each school's own published fees; some figures are sourced from third-party aggregators.
What curricula do ISS International School and Overseas Family School offer?
ISS International School: IB, American. Overseas Family School: IB, British.
Do ISS International School or Overseas Family School offer boarding?
ISS International School: day school only. Overseas Family School: day school only.
This comparison is BrightKey's independent assessment using verifiable public data only. University-placement figures are school-reported and not independently verified. BrightKey takes no payments from schools. Our method →