Different types of schools entered their pupils for different examinations at age 16. Grammar school students would take General Certificate of Education (GCE) O-levels, while children at secondary moderns initially took no examinations at all. Instead, they worked for a Schools Certificate, which simply indicated they had remained at school until age 15. Then some of the secondary modern schools offered qualifications that were set, for example, by regional examination boards, such as the Union of Lancashire and Cheshire Institutes and the Northern Counties Technical Examinations Council. The latter exam was taken after four years at secondary school. Such examinations were comparable with the Certificate of Secondary Education (CSE) which was introduced in 1965. Less demanding than GCE O-level, results in the GCE and CSE exams were graded on the same scale, with the top CSE grade, grade 1, being equivalent to a simple pass at GCE O-level.