An American-curriculum Pre-K to Grade 12 school at kilometre 15 on Bangna-Trad, further out than the Bang Kaeo cluster and, on current evidence, the only school in Samut Prakan with real boarding houses on campus. It offers an unusually wide set of exit qualifications — the AP Capstone Diploma, the AP International Diploma and the IB Diploma, for which it was authorised in March 2022.
Also known as: ASB Green Valley, ASBGV. The group's other campus, on Sukhumvit Soi 49/3, is in Watthana, Bangkok — only Green Valley is in Samut Prakan. Do not merge the two.
What has changed here recently
Samut Prakan is the one province in this guide where the school field is genuinely unstable — a school closed in July 2026, another changed its leaving qualification, a third opened a secondary campus. This section records what a directory listing is most likely to be wrong about.
ASB Green Valley took IB Diploma authorisation in March 2022, which makes it the province's third IB Diploma school and the only one anywhere in Samut Prakan running the IB Diploma alongside AP Capstone. Guides written before 2022 — including descriptions still circulating — present it as a purely American AP school.
Where this school stops
Grade 12.
What a leaver actually holds
The curriculum label and the leaving qualification are different things, and in this province they diverge more than anywhere else covered. For a family that may move country again, this line is the decision.
Unusually, three routes: the AP Capstone Diploma, the AP International Diploma and the IB Diploma. Very few schools in Thailand run AP Capstone and the IB Diploma side by side.
Where the campus actually is
900 Moo 3, Bangna-Trad Road km. 15, Bang Phli, Samut Prakan 10540
At kilometre 15 on Bangna-Trad, materially further east than the Bang Kaeo cluster at kilometres 7 and 8 — a real difference at 7am, not a rounding error. No rail at the campus. Its boarding provision is the practical answer to that distance.
Area guides families use for this school run: Bang Na (Samut Prakan side)
The curriculum pathway, stage by stage
- Pre-K through elementary and middle school on an American programme built on Common Core and NGSS.
- Grades 11 to 12 — the school offers the AP Capstone Diploma, the AP International Diploma and the IB Diploma, all taught on campus.
Accreditations & authorisations
Worth separating: an examination-board authorisation (Cambridge, IB, College Board) means a school may enter pupils for those exams. A whole-school accreditation (WASC, CIS, NEASC, Cognia, ISQM) assesses the school itself. A membership is neither. Both matter; they are not the same claim — and in Samut Prakan three of the ten schools publish no accrediting body at all.
- DISPUTED — see flags. The school's own footer, under the heading 'Accredited and Authorized by', links to NEASC. Every third-party directory says WASC. These are different bodies and we do not know which is current.
- LICENSED — Thai Ministry of Education; quality-assured by ONESQA, both credited in the school's own footer.
- AUTHORISED — College Board, for Advanced Placement and AP Capstone.
- AUTHORISED — International Baccalaureate, Diploma Programme, per the IB's own register (record 062040, authorised 1 March 2022).
Religious character
Publishes nothing.
Boarding
Yes, and this is the finding that matters most about this school: ASB Green Valley operates real boarding houses. It publishes two dormitories on campus, one for male and one for female students, with day and boarding options. On current evidence it is the only school in Samut Prakan with an actual boarding house rather than a homestay arrangement or a group facility at a different campus — which makes it the province's only realistic option for a family based outside the Bangna-Trad corridor, or outside the province entirely.
Who it suits
Families who want an American programme with a genuine choice of exit qualification, and above all families who need boarding. If boarding is a requirement, the shortlist in this province is short and this school is on it.
What we could not verify — and where sources disagree
We publish these openly rather than smoothing them over. A school guide that hides its uncertainty is not much use to a family making a decision this big.
- The accreditation body is genuinely disputed and we will not pick one. Every directory says WASC; the school's own footer credits NEASC; a neighbouring school's FAQ also calls it 'a WASC accredited school'. WASC and NEASC are separate accreditors. Ask the school directly which body currently accredits it and when the term expires.
- Roll size, class size and ratio are not published.
- The group operates a second, Bangkok campus under the same brand. Confirm you are contacting Green Valley and not Sukhumvit — they are in different provinces with different provision.
Ask every Samut Prakan school this
- Is this school still operating, under this name, this year? Samut Prakan is the one province in this guide where a school on families' shortlists closed — VERSO ceased operations on 31 July 2026 — and directories still list it as enrolling. Check the school's own homepage for a closure or rebranding notice before you do anything else.
- What qualification does a Grade 12 or Year 13 leaver actually hold? Not the curriculum label — the qualification. Raffles moved from Advanced Placement to the IB Diploma without the directories noticing, TCIS displays an IB logo while holding only candidate status, and D-PREP names no leaving qualification at all.
- Where does this school stop? SISB Suvarnabhumi ends at Primary 6 and awards nothing, despite being marketed across the Bang Kaeo property corridor as an international school.
- Is the school ACCREDITED, or AUTHORISED, or a MEMBER? Ask for the body, the status word and the expiry date. Three of the ten schools here name no accrediting body at all, one is disputed between WASC and NEASC, and one is somewhere between CIS membership and CIS accreditation.
- If boarding matters, is it a boarding house on this campus? SISB's boarding is real but sits at a different campus in Bangkok, and Concordian's residency programme cannot be confirmed as currently operating. ASB Green Valley and Wycombe Abbey are the ones publishing houses on site.
- Which province is the campus actually in, and which campus am I contacting? Almost every school here markets itself as Bangkok. Several groups run a Bangkok campus and a Samut Prakan campus under one brand with different provision — ASB, SISB, TSI and D-PREP all do.
- How long is the drive at 7am, from the address you are actually considering? The school belt spans kilometre 7 to kilometre 15 on Bangna-Trad plus a separate Samrong cluster. Those are not interchangeable at rush hour.
- Does the school publish a bus route that reaches you — or only a catchment claim? Only D-PREP publishes actual routes. Everyone else has a bus with no published coverage, which cannot be planned around.
BAANLYY does not rank, endorse or accept payment from schools. Facts on this page are compiled from The American School of Bangkok, Green Valley Campus's own published material and independent cross-checks, and we deliberately publish no per-school fee figures — they change annually and a stale number is worse than none. Always confirm current admissions, fees, year groups, accreditation status and campus details directly with the school. Visit the official The American School of Bangkok, Green Valley Campus page →
Sources & References
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
Find a home for this school run
Samut Prakan’s school belt runs from kilometre 7 to kilometre 15 on Bangna-Trad, plus a separate rail-served cluster at Samrong. Settle the school first, then match an area.
