Primary-Only Schools in Pattaya.
Two options.

International School of Chonburi (ISC, ages 2–11, NEASC-accredited English National Curriculum) and Lovell International School (ages 2–11, Reggio-inspired British EYFS/KS1-2 in Naklua). Both require a secondary transfer — typically at Year 7. Phoenix is not primary-only; its current official pages extend through Secondary 6/Year 13.

Not according to its current official scope: BEST now publishes fees through Secondary 6. BPIS remains a separate British IGCSE/A-Level option, but the old claim that every BEST pupil must transfer after primary is no longer accurate.

ISC serves ages 2–11 only. Families typically transfer to MIS, TPIS, Regents, BPIS, or other secondaries at Year 7. Read each secondary editorial's admissions page for transfer requirements.