State schools can be classified according to the age range of the pupils and the type of education provided. Basically, there are two type of schools: primary and secondany. Primary schools cater for childen aged 5-11 and secondary schools for ages 11-16 (and up to 19). Primary schools can be sub-divided into infant schools (for ages 5-7) and junior schools (for ages 7-11). Secondary schools may be of one type for all abilities, viz comprehensive schools; most secondary schools are of this kind. Alternatively, the pupils may be grouped according to their ability and selected by means of an examination at the age of 11 (known as the "11 plus exam"). Thus, grammar schools, cater for those with academic ability; modern schools for those with less academic ability; and technical schools for those with more practical skills