Passage: The Department for Education is the government department responsible for issues affecting people in England up to the age of 19, including education. State-run and state-funded schools are attended by approximately 93% of English schoolchildren. Of these, a minority are faith schools (primarily Church of England or Roman Catholic schools). Children who are between the ages of 3 and 5 attend nursery or an Early Years Foundation Stage reception unit within a primary school. Children between the ages of 5 and 11 attend primary school, and secondary school is attended by those aged between 11 and 16. After finishing compulsory education, students take GCSE examinations. Students may then opt to continue into further education for two years. Further education colleges (particularly sixth form colleges) often form part of a secondary school site. A-level examinations are sat by a large number of further education students, and often form the basis of an application to university.

Question: What test do they take after they're done with classes?
GCSE examinations