ISE vs St Andrew's.

Five questions.
Five answers.

1. Do you want IB Diploma on American AERO/NGSS — or on British IB PYP + IGCSE?

This is the structural fork between these two IB Diploma day schools. ISE runs American AERO + NGSS from primary, with an American high-school diploma and an IB Diploma route at G11–12. The current sources cited on this page do not establish a scheduled MAP, PSAT or SAT programme, a university-application platform service or transfer-credit arrangements. St Andrew's runs IB Primary Years alongside British National Curriculum from primary, then IGCSE and IB Diploma at Sixth Form. Families planning for a particular university should ask both schools to map the intended course against current entry requirements and provide the available subjects, counselling and testing support in writing.

2. Is a Dutch language programme a dealbreaker?

St Andrew's publishes three to six hours per week of Dutch language and culture lessons from Reception through secondary, with CNaVT and IBDP Dutch routes. The school describes this offer as its Dutch Stream; it is not a full Dutch-medium parallel curriculum. ISE does not publish comparable Dutch instruction. If sustained mother-tongue Dutch matters, verify the current timetable and qualification route with St Andrew's. If your family is English-medium only, move to commute and fee calculus.

3. Sriracha commute or Rayong commute — where does your family live?

ISE is inside Burapha Golf Club at 282 Moo 5, Bowin, Sriracha; St Andrew's is at 1 Moo 7, Banchang-Makham Koo Road, Ban Chang, Rayong. Neither address supports a universal commute estimate or winner. Test both journeys from the real home during school traffic and request current pickup, ride and late-activity timings.

4. Can you budget ISE exact tuition-only vs St Andrew's published fee band?

ISE gives exact published tuition-only numbers: ฿358K (Pre-K) → ฿514K (K–G5) → ฿601K (G6–8) → ฿617K (G9–10) → ฿646K (G11–12 IBDP). Add lunch, bus, and exam fees for all-in. St Andrew's publishes fee bands (฿213K–868K/yr) plus one-time fees — use the school's 2026/27 PDF for the exact year-group amount. St Andrew's is lower at entry and at Year 1 peer comparison; ISE's exact structure suits families who model budgets in spreadsheets. Neither is a budget-tier option — both sit in established-to-premium IB territory.

5. ISE's published ratio — or Cognita forest-school scale?

ISE publishes a student-to-teacher ratio below 8:1, while current enrolment is not published, and holds WASC accreditation plus IBDP authorisation recorded since 2004. St Andrew's publishes a 30-rai Cognita campus, about 450 students, Forest School outdoor pedagogy, eco-literacy projects and an EDT Silver rating. Ask either school for its current transfer and placement policy rather than assuming network or transcript portability. Test both campuses with your child; the published scale and programme labels are starting points, not guarantees of classroom fit.

Summary verdict

• Choose ISE if: American AERO/NGSS with American high-school diploma and IB Diploma routes fits your plan; WASC accreditation and the published ratio below 8:1 matter after you verify the actual class; the Bowin route works from your address; and admissions confirms the intended senior subjects, counselling and testing support in writing.
• Choose St Andrew's Green Valley if: IB Primary Years + Diploma with British IGCSE foundation fits your plan; Dutch language and culture lessons matter; Forest School and eco-literacy ethos suit your child; Cognita network transfers are part of your planning; you accept published fee bands and will download the 2026/27 PDF; and lower entry-year published fees (฿213K Nursery 3 half-day vs ISE ฿358K) matter for your budget.

Neither fits — if…

You need Pattaya-side premium IB with boarding — see St Andrew's vs Regents. You want Rayong British IB without American overlap — see Garden vs St Andrew's. You want American/IB versus lower-fee British A-Level in Nongprue — see ISE vs MIS. You need pure British A-Level without IB — see Rugby vs St Andrew's.

Make the IB comparison child-specific

Ask both schools for the current IB Diploma subject list, prerequisites, timetable blocks, counselling sequence, examination charges and recent cohort context. ISE’s IB route sits alongside an American high-school diploma; St Andrew’s follows British and IB PYP foundations toward IGCSE and the Diploma. The shared IB endpoint does not make the preceding education or fallback route identical.

For a younger pupil, compare the classroom they will enter rather than the qualification they may take years later. At ISE, observe how AERO and NGSS expectations appear in teaching and ask for the actual class size. At St Andrew’s, ask how British curriculum and PYP work together, and observe Forest School or outdoor learning only if it is part of the proposed class’s normal timetable.

Use complete invoices and real routes

Start with standard 2026/27 tuition, then add application, registration or enrolment, refundable deposits, meals, transport, books, uniform, trips, examinations and assessed support. Keep payment discounts separately labelled. ISE’s tuition excludes lunch, bus, uniform and IB examinations; St Andrew’s family should request the exact year-group row and all compulsory extras from its current schedule.

Run both journeys during school traffic and obtain exact bus quotes to the home address. Record pickup times and late-activity returns beside the invoice. The defensible choice is the package whose present classroom, full annual cost, IB subject route and weekly commute all work for this child—not simply the school whose curriculum label sounds more familiar.