The Overseas School of Colombo remains Sri Lanka's oldest internationally accredited educational institution.

The majority of the families come from foreign missions, United Nations organisations and NGOs, while the rest are mainly from the corporate sector.

OSC graduates go on to universities in the United States, England, Canada, Australia, and Sri Lanka among other countries.

The SGA consists of an Executive Committee and a membership of two elected representatives from each grade level guided by a teacher supervisor.

All Secondary School students enroll in community service projects which mostly take place on Thursday afternoons.

The projects range from work with sick or orphaned children, to support for street dogs through inoculations.