Siam International School (Siam IS)

In Brief

SISB is a large British curriculum school network with five Bangkok campuses serving over 4,500 students, offering competitive fees compared to tier-one institutions. While it provides accessible international education with solid academic results, teacher discussions reveal serious concerns about working conditions and management practices typical of for-profit chains.

SISB operates five campuses across Bangkok following the British National Curriculum from nursery through A-Levels, with fees ranging from 350,000 to 1.1 million THB annually. The school network serves a diverse student body of 40+ nationalities, though approximately 60% are Thai nationals. Recent academic results show 68% A*-B grades at A-Level and 72% A*-B at IGCSE, with 95% of graduates progressing to top-100 global universities. The flagship New Rama 9 campus features modern facilities including Olympic-sized pools and performing arts centers.

Teacher feedback reveals significant workplace challenges common to the broader Singapore International School brand operating across Southeast Asia. Reports indicate long working hours enforced by fingerprint scanners, limited holidays compared to other international schools, and a toxic work environment with high staff turnover. The infamous end-of-year concert preparation extending into June appears to be a network-wide requirement that both teachers and students reportedly dislike. These operational practices align with the for-profit model that prioritizes financial returns over staff welfare, making it less attractive to experienced international educators compared to non-profit institutions like ISB or NIST.