GSIS distinguished itself by achieving accreditation with the Western Association of Schools and Colleges (WASC) in 2007, during its first year of operation.
In 2009, the school became a member of the International Baccalaureate Organization (IBO) upon its authorization to offer the IB Diploma Programme(DP), the Primary Years Programme (PYP) and Middle Years Programme (MYP). GSIS has offered the full IB Programme in all three divisions since 2012.
GSIS is an active member of the Association of Christian Schools International (ACSI), the East Asia Regional Council of Overseas Schools (EARCOS) and the Korean-American Interscholastic Activities Conference (KAIAC).
The GSIS CEEB code is 682018 (used for college applications and reporting SAT scores).
In 2009, the school became an overseas test center for The College Board (PSAT and SAT). Its SAT test center code is 65170 (used only when registering for the SAT as the GSIS test center).
GSIS maintains associate membership status with the Korea Council of Overseas Schools (KORCOS).