The country's literacy level stands at 85% of the whole population. Preschool, which targets children from age three to five, is an integral component of the education system and is a key requirement for admission to Standard One (First Grade). At the end of primary education, pupils sit the Kenya Certificate of Primary Education (KCPE), which determines those who proceed to secondary school or vocational training. The result of this examination is needed for placement at secondary school. Primary school age is 6/7-13/14 years. For those who proceed to secondary level, there is a national examination at the end of Form Four – the Kenya Certificate of Secondary Education (KCSE), which determines those proceeding to the universities, other professional training or employment. Students sit examinations in eight subjects of their choosing. However, English, Kiswahili (languages) and mathematics are compulsory subjects.