South Sudan has a 3-8-4 formal education structure. There are three years of pre-primary school, which has an official entry age of three and is referred to as early childhood education development (ECED). Primary school, which is known as primary education (P1 to P8), has an official entry age of six and a duration of eight grades. At the end of the cycle, students receive the primary education certificate. Secondary school, which is known as secondary education (S1 to S4) consists of grades 9-13 and culminates in the secondary school certificate. In addition, South Sudan has two upper secondary vocational education tracks that last two to four years (ISCED 2011 mapping for 2014 school year).