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Languages taught at the school include English as the primary medium of instruction and Japanese as a language class. English is used across the curriculum and is taught by teachers qualified to support students for whom English is not their first language. Japanese language classes are offered to support bilingual development. The Ontario Program provides instruction in English from kindergarten through Grade 12 and leads to the Ontario Secondary School Diploma.
Columbia International School uses the Ontario curriculum delivered in English by teachers qualified to teach English to students whose first language is not English. Japanese language classes are also offered to support bilingual development, helping students become proficient in both English and Japanese. The program runs from kindergarten through Grade 12, including the Kindergarten (幼稚部), Elementary (小学部), Middle School (中等部), and the specialized vocational program (専修学校高等課程).
Saturday School provides an immersion-based program built on the school's regular immersion approach. All classes in Saturday School are conducted in English, focusing on conversation through subjects such as English, social studies, science, mathematics, computer science, and sports. The program is designed to be relaxed and engaging, with emphasis on communication among teachers and classmates. This Saturday School is separate from the regular day program and offers external students the experience of an international school environment, with many participants later enrolling at Columbia.
Columbia International School is a K–12 school in Tokorozawa, west of Greater Tokyo, with access via Higashi-Tokorozawa Station on the JR Musashino Line. Teaching follows the Ontario (Canada) curriculum and all courses are taught in English, with Japanese (Kokugo) lessons offered daily up to Grade 8. The school offers a boarding program, with a dormitory located about an 8-minute walk from campus and supervised daily by a resident dorm supervisor. Co-curricular options listed by the school include activities such as art, newspaper, soccer, music club, yearbook club, photo club and drama club. For older students, the school notes that the Grade 11 Guidance Overseas Trip (G.O.T.) is a compulsory activity.