There was a preceding try and unite both of these disparate qualifications during the 1980s, using a demo "16+" assessment in a few topics, awarding both a CSE and an O-Level certificate, before the GCSE was introduced. The final O-stage/CSE examinations were being sat in 1987. Introduction in the GCSE[edit] http://cristianodozk.blogthisbiz.com/11505809/google-certification-course-fundamentals-explained