Siam International School (Siam IS)

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.

Strengths

• Lower fees than premium Bangkok international schools while maintaining British curriculum
• Five convenient campus locations across Bangkok
• Solid academic results with 95% university placement rate
• Modern facilities including pools, science labs, and performing arts spaces
• Diverse international community with 40+ nationalities represented
• Established track record since 2001 with continued expansion

Considerations

• Teacher reports of poor working conditions and high staff turnover
• For-profit management structure may prioritize finances over educational quality
• Long working hours and limited holidays compared to other international schools
• Part of a regional chain with documented workplace issues across multiple countries
• Less prestigious than tier-one schools like ISB, NIST, or Shrewsbury
• May experience the instability typical of commercially-driven educational institutions

• The pool of online parent reviews is small and concentrated on directory sites. Tone is consistently warm rather than analytical.
• The repeated positive theme is small classes and individual attention, with parents saying their children are happy and noticeably more confident over time.
• Teachers are described as caring and professional, with parents crediting the school with shaping behaviour around respect and responsibility.
• Practical caveat: the campus sits in Pathumthani, around 46 km from central Bangkok, which constrains how relevant it is to families committed to inner-city Bangkok.
• Curriculum runs Kindergarten to Grade 6 only, recognised by Thailand's Ministry of Education, with Cambridge content as the international layer.