GCSE /ˌdʒiː siː es ˈiː/ BrE AmE noun [uncountable and countable]
(General Certificate of Secondary Education) an examination in a range of subjects, done by students in schools in England and Wales, usually at the age of 15 or 16 ⇨ O level , A level , GNVQ
do/take (your) GCSEs
Adam took his GCSEs last year.
GCSE exam/course/coursework/results etc