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Sri Lanka, Colombo
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English is the language of instruction. In the IB Diploma Programme, languages offered include Hindi A Lit, Spanish A Lit, French AB, and Mandarin AB, with Spanish B and French B as language B options. The school also supports language heritage learning through the Mother Tongue program in the Middle Years Programme and the SSST option in the Diploma Programme.
The school offers a Mother Tongue program in the Middle Years Programme to study students' home languages. In the Diploma Programme, the School Supported Self-taught (SSST) Language A option allows students to pursue their mother tongue and can lead to a Bilingual Diploma. A tutor is identified by the parents with support from the OSC Language Coordinator, and students are expected to complete around 50 hours in the academic year; on-site training and online IB workshops are provided. Parents sign a written agreement to pay tutoring costs independent of OSC's tuition.
Founded more than 65 years ago, the Overseas School of Colombo is a non-profit, co-educational English-medium day school serving ages 3 to 18. It offers the International Baccalaureate continuum—PYP for Early Years to Grade 5, MYP for Grades 6–10, and the Diploma Programme for Grades 11–12—with self-taught mother-tongue support and online Pamoja options. OSC is the only IB World School in Sri Lanka. The school's motto, Unity in Diversity, guides a holistic, inquiry-based approach; the curriculum emphasizes international-mindedness, learner ownership, and, in the DP, Theory of Knowledge, the Extended Essay and CAS. The five-acre, green campus houses six buildings, four science labs, three design labs, two libraries with over 25,000 volumes, and extensive arts and IT facilities, plus a 25-metre pool, gym, auditorium, and multiple playing fields. A broad after-school program includes AMC Math Club, Linguistic Adventures, COMUN, and SAISA, with service learning through CAS and Week Without Walls.
