International School Admissions Bangkok 2026 | International Schools Guide

The brief

The top four are waitlisted, often 12 to 18 months out. Patana, NIST, ISB and Shrewsbury Riverside take a non-refundable deposit to hold your place in the queue.
Year 6 and Year 7 are the worst bottleneck. Families lock in early for the secondary transition, so this is the year that closes first.
Mid-year placement is harder than the published process suggests. Bangkok runs on an August start, and most premium schools assess in cohorts rather than rolling.
The schools that test on entry (Patana, NIST, ISB, Shrewsbury, King's Bangkok, Harrow) use CAT4 plus school-set papers in English and maths from around Year 3 upward.
The 2025 to 2026 wave of new openings (Dulwich, SPGS, Wycombe Abbey, Brighton Vibhavadi, Jataka) is the first real pressure-release valve Bangkok has seen in years.

The Bangkok admissions market in one paragraph

Admissions at Bangkok's top international schools are structurally tight, not because the city is short of schools, but because four institutions concentrate the demand. Bangkok Patana, NIST, International School Bangkok and Shrewsbury have, between them, roughly 7,500 to 8,000 places across all year groups, against a settled expat population, a growing Thai professional class paying international fees, and corporate transfers landing on the August calendar. The result is a waitlist culture: families register years out, pay a holding deposit that is often non-refundable, and treat the queue as the real admissions process. The standard application is the second step, not the first.

When the application calendar runs

The Thai academic year at British, IB and American international schools begins in August. The admissions year that feeds it begins about twelve months earlier.

September to November: main application window opens for the following August. The top tier begins assessing.
November to January: assessment season at the flagships. Patana, NIST, Shrewsbury and ISB run cohort-style assessment days; offers go out in waves through Q1.
January 15: Patana's Thai-national deadline. Thai passport holders run on a separate, earlier track. ISB and several British-brand schools also maintain parallel tracks for Thai, dual-national and expatriate applicants.
February to April: offers confirmed, deposits paid, year groups close at the popular entry points.
May to July: late-arrival window. Pressure is on the secondary year groups. Families turning up here typically slot into mid-tier schools or join a waitlist for August of the following year.

Mid-year arrivals (after October) are the hardest cohort. Bangkok premium schools do not run a rolling intake the way Singapore or Dubai schools sometimes do. A January placement at Patana, NIST or ISB is unusual unless a sibling exit creates the seat.

Year-group bottlenecks: where the queue forms

The waitlists are not evenly distributed. They cluster.

Year group	Pressure	Why
Nursery / Pre-K (age 2 to 4)	High at Patana, NIST, Shrewsbury	Foundational entry. Families register years out.
Reception / Year 1 (age 5)	High	Last clean entry before the school sets its primary cohort.
Years 2 to 5	Moderate	Movement depends on expat turnover, which is constant but unpredictable.
Year 6	High	Families consolidating before the secondary transition. The worst bottleneck.
Year 7	High	New families targeting British-system secondary entry. Capacity already set by Year 6 internal promotion.
Years 8 to 9	Moderate	Some movement as families relocate out of Bangkok.
Years 10 to 11	Low to moderate	IGCSE-cycle disruption deters most transfers. Schools selective about taking new pupils mid-IGCSE.
Year 12 (Sixth Form / IB DP)	Moderate at top schools	Competitive for IB Diploma entry. Requires specific IGCSE grades.
Year 13	Low	Almost no school accepts new entrants into the final IB year.

The Year 6 / Year 7 bottleneck is the one Bangkok parents talk about most. A child already at Patana or NIST in Year 5 has secondary entry effectively secured. A family arriving with a Year 6 child does not: internal promotion takes most of the secondary seats before external applications are considered.

What a Bangkok waitlist really means

A waitlist at the top four is not a casual sign-up sheet. The structure:

An application fee (typically THB 5,000 to 15,000, non-refundable) opens the file.
If the year group is full, the family is placed on the waitlist.
To hold the position, several schools require a deposit, a portion of first-term fees or a separate registration fee, depending on the school. This is non-refundable or partly non-refundable. The exact mechanism varies; current figures need confirming directly.
When a seat opens, the family typically has 48 to 72 hours to confirm before the offer moves to the next name.

The deposit element is the part that surprises new arrivals. Bangkok waitlists are paid waitlists at the premium tier. Families who do not pay the deposit are often listed as "expressing interest" rather than queued. The deposit also buys visibility: admissions teams prioritise families who have committed financially and stay in contact.

Assessment and interview: what schools test

Every premium Bangkok international school assesses. The format depends on age and curriculum.

Ages 2 to 4 (early years). A play-based observation, 30 to 60 minutes. Assessors watch how the child separates from parents, follows simple instructions, and interacts with peers. No academic pass mark.

Ages 5 to 10 (primary). Written tasks in English and mathematics, often supplemented by a CAT4 cognitive ability test from around Year 3 upward. CAT4 is the standard at Patana, Shrewsbury, King's Bangkok and most British-system schools. NIST and ISB use their own school-set assessments and, in some cases, MAP testing.

Ages 11 to 15 (secondary). More formal: English comprehension and writing, mathematics, reasoning (CAT4 or equivalent), sometimes a second-language assessment, plus a student interview. At Shrewsbury and NIST the assessment runs across a half-day or a full morning.

Ages 16+ (Sixth Form / IB DP). Academic transcripts, predicted or actual IGCSE grades, a personal statement and an interview. NIST and Patana require specific minimum grades for IB Diploma entry.

CAT4 is used as a calibration tool, not a sole entry filter. A low CAT4 score combined with strong school reports usually triggers a conversation about support, not a rejection. The reverse pattern (high CAT4, weak reports) raises different questions.

Reading the top tier: where pressure clusters and how

A practical map of where the queues form.

Bangkok Patana

The largest single campus in Bangkok and the deepest waitlists. Internal promotion from primary to Year 7 fills most secondary seats before external applications are processed. Pressure is highest at Pre-KG, KG1 to KG2, Year 1, Year 6 and Year 12. A separate Thai-national track runs with a January 15 deadline. Families targeting Patana from outside Thailand typically register 18 to 24 months ahead.

NIST

The only full IB-continuum school in central Bangkok, which concentrates IB-track demand into a single waitlist. All year groups carry pressure. No new central IB competitor has been announced, so the queue has not eased in recent cycles. Mid-year placement is rare.

ISB

ISB's defining constraint is geography, not waitlist length. The school sits inside Nichada Thani, a gated community in Nonthaburi, with a 45 to 60 minute commute from central Bangkok in normal traffic. Most ISB families live inside Nichada or in Chaeng Wattana. Pressure is highest at Early Years through Grade 2, and at Grade 6 to Grade 7. ISB runs separate application tracks for Thai, dual-national and expatriate applicants, with significant sibling priority.

Shrewsbury

Two campuses: Riverside (full 2 to 18) and City Campus (primary only, Sukhumvit). Riverside runs the longer queue. City Campus is the back-door route for families who want the Shrewsbury name but cannot secure a Riverside place at the year group they need. The opening of SPGS Bangkok sits in close proximity to Shrewsbury Riverside and is the most likely pressure-release for this corner of the market.

The next tier: King's, Harrow, DBS, Wellington, Brighton

Pressure exists but is less acute than at the top four. Wellington (WCIS) and Harrow are the closest to top-tier waitlists, particularly at popular year groups. DBS Denla has grown into a credible alternative for families priced out or shut out of the top four. King's Bangkok opened in 2018 and has filled rapidly. Brighton (Krungthep Kreetha and Vibhavadi) has more current availability, with Vibhavadi only opening September 2025.

What's new in 2026

The opening wave of Dulwich College Bangkok (Prawet, near the Patana catchment), SPGS Bangkok (Riverside, near Shrewsbury), Wycombe Abbey Bangkok (eastern corridor, with boarding) and Jataka (a new entrant) is the first material capacity increase Bangkok has seen at the premium tier in years. Founding-year entry is typically the easiest moment to secure a brand-name place, before assessment thresholds and waitlists settle in.

How families maximise their chances

What the Bangkok market consistently rewards.

A 12 to 24 month runway at the top four. The deposit secures the queue position; the queue position is the real application.
Three applications, not one. A first-choice premium school, a credible second-tier (King's, Harrow, DBS, Wellington), and a confirmed-place option at a mid-tier school. The third is the safety net that lets a family move to Bangkok on schedule.
An entry point that matches the school's intake structure. A Patana Year 6 application is harder than a Patana Pre-KG application by a wide margin at the same school.
Honest disclosure of learning support needs. Bangkok schools have varying SEN capacity. Non-disclosure causes problems after enrolment; honest disclosure rarely causes a rejection at the established schools.
A specific, recent school reference. A teacher who knows the child carries more weight than a head-stamped form letter.
Continued contact during the wait. A polite check-in every six to eight weeks keeps a family visible. Silence reads as reduced interest.
The 2026 founding-year openings. Dulwich, SPGS, Wycombe Abbey, Jataka and Brighton Vibhavadi offer the easiest premium-tier entry Bangkok has seen for a decade.

FAQs

Do I need to pay a deposit to be on a waitlist in Bangkok? At the top four (Patana, NIST, ISB, Shrewsbury), yes, in most cases. The deposit holds the queue position and is often non-refundable or partly non-refundable. The exact mechanism varies by school.

How long is the wait at Patana for Year 6? Year 6 is one of the tightest year groups across the top four. Wait times of 12 to 18 months are common, and there is no guaranteed timeline. Patana's internal promotion fills most secondary seats from Year 5 already enrolled.

Can my child start mid-year at ISB, NIST or Patana? Possible but uncommon. Bangkok premium schools assess in cohorts rather than running a rolling intake, and mid-year placements depend on a sibling exit creating the seat. Most mid-year arrivals are placed at mid-tier schools and join the waitlist for the following August.

Which schools assess with CAT4? CAT4 is standard at Patana, Shrewsbury, King's Bangkok, Brighton, Harrow and most British-system schools, typically from around Year 3 upward. NIST and ISB use their own school-set assessments. CAT4 is a cognitive ability test, not a curriculum test, so children cannot be meaningfully coached for it.

Do Thai nationals apply on the same track as expatriates? Several schools run separate tracks. Patana has a January 15 deadline for Thai nationals. ISB maintains separate Thai, dual-national and expatriate tracks. Eligibility depends on passport, residency and parental status.

Should I hire an admissions consultant in Bangkok? Bangkok does not have a significant admissions consulting market in the way Hong Kong or London do. The process is direct: apply, pay the deposit, attend the assessment. A consultant adds cost without meaningful advantage at most schools. Where it can help is on relocation logistics (housing-school matching, tour scheduling), not on the application itself.

My company starts in October. Can my child be in school for the start of term? With a place secured 12 months ahead, yes. Without one, the realistic outcome is a place at a mid-tier school for the remainder of the academic year, with a waitlist application running for the following August. Corporate transfers landing in autumn without a school plan are the most stressful searches in the city.

Sources

This article draws on published admissions information from the schools named above and the Bangkok international school market across the 2025 to 2026 cycle. Specific deposit amounts, fee schedules and Thai-national deadlines need confirming directly with each school's admissions office.

We work hard to make every figure, date and description on this page accurate. We don't always get it right. If you spot an error, a fee that's changed, a fact that's out of date, something we've got wrong, please tell us. Use the feedback button above or email us directly. We'll check it and update the article.

International School Admissions in Bangkok