Tonga's education system is structured similarly to many Commonwealth countries, comprising primary, secondary, and tertiary levels. Education is compulsory and free for children aged 6 to 14, covering six years of primary school. Following primary education, students progress to secondary education, which spans five years (ages 12-17) and culminates in the Tonga School Certificate. There are 22 high schools in Tonga, with the majority operated by missionaries. While the provided resources detail the overall structure of the Tongan education system, they do not provide specific information about optional subjects offered in Form 6. Additional information about the curriculum can be found on the Tonga Statistics Department website and the Scholaro website. Tonga has been working with partners to improve literacy and numeracy, focusing on boys, children from poorer families, and children with disabilities.