The selection did not give a desirable result. By 1949 it began to emerge that about 20-25 percent of the apparently carefully selected grammar school pupils could not cope with an academic education and were leaving schools early. Some modern secondary schools were more successful in terms of the examination results than some grammar schools. Ample evidence was emerging that many very able children whose ability developed strongly after the age of 10 were being misallocated by 11plus tests. This dissertation from.Another unfortunate result of selection was that some 70 percent of all 11-year-old children who went to the secondary modern schools started their secondary education with the stigma of having failed the 11 plus. There was no clear concept of the secondary modern schools which were just what was left after selecting the more able children to the grammar and technical schools. Young people were leaving their schools at 16 without any recognised qualifications.The third part of the tripartite structure, the secondary technical schools, failed to materialise. Secondary technical schools took about 4 per cent of the children compared with 70 percent for the secondary modern and 20 percent for the grammar schools. There were simply very few of them. The grammar schools with their academic values had a disproportional prestige compared with their technical counterparts.