Students at Island School sit examinations offered by the UK Examination Boards (Edexcel, Cambridge Assessment International Education and AQA) and the International Baccalaureate Organisation.

The majority of Year 10 students are entered in IGCSE First Language English exams while a selected few are enrolled in IGCSE Chinese.

In Year 11, students sit the rest of their GCSE (General Certificate of Secondary Education) and IGCSE (International GCSE) examinations. Students primarily sit the examinations of their entrance subjects in May and June of Year 11. Results are published in mid to late August.

In Years 12 and 13, students may study the IB (International Baccalaureate) Diploma programme, leading to examinations in six subjects in May of Year 13. Alternatively they may opt to study BTEC Level 3 courses (through Edexcel), or IBCP (IB Career-related Programme), which are assessed at different intervals throughout Years 12 and 13 to enhance the learners’ practical experience through vocational education. IB Diploma and Career-related Programme results are published in early July while BTEC final results are normally available in mid-July to August.