[1] The school caters for children of all nationalities from 5 through to 16 years of age.
The school offers an International Education system, consisting of International Primary Curriculum (IPC), along with American and British curriculum programs.
The Head of Administration and the Academic head are empowered to run their respective areas of duties while an Advisory Committee provides support and ideas to aid GIS’s progress.
The Board of GIS is tasked with policy formulation for the wellbeing of the school.
[2] The following facilities can be found at Greenoak's school campus: See also: List of schools in Port Harcourt See also: List of hospitals in Port Harcourt