The General Certificate of Secondary Education (GCSE) is an academic qualification awarded in a specified subject, generally taken in a number of subjects by students aged 14–16 in secondary education in England, Wales and Northern Ireland and is equivalent to a Level 2 (A*- C) and Level 1 (D- G) in Key Skills. (In Scotland, the equivalent is the Standard Grade.) Some students may decide to take one or more GCSEs before or afterwards; people may apply for GCSEs at any point either internally through an institution or externally. The education systems of other British territories, such as Gibraltar, and the former British dominion of South Africa, also use the qualifications, as supplied by the same examination boards. The International version of the GCSE is the IGCSE, which can be taken anywhere in the world, and which includes additional options, for example relating to coursework and the language used. When GCSEs are taken by students in secondary education, they can often be combined with other qualifications, such as the Business And Technology Education Council (BTEC), the Diploma in Digital Applications (DiDA), or diplomas.