Secondary moderns did develop O-level courses for brighter students, but in 1963 only 41,056 pupils sat them, roughly one in ten. Some of these pupils' results were very good. Indeed, during the 1960s, students from secondary modern schools who took GCE 'O' Levels were increasingly achieving results comparable to those being achieved by students from grammar schools. This was remarkable given the disadvantages of secondary modern schools compared to grammar schools in providing education for GCE O-Level candidates. Accordingly, the entire rationale for Tripartite streaming of students based upon the 11-plus examination was called into question.