The education system of Georgia has undergone sweeping modernizing, although controversial, reforms since 2004. Education in Georgia is mandatory for all children aged 6–14. The school system is divided into elementary (six years; age level 6–12), basic (three years; age level 12–15), and secondary (three years; age level 15–18), or alternatively vocational studies (two years). Students with a secondary school certificate have access to higher education. Only the students who have passed the Unified National Examinations may enroll in a state-accredited higher education institution, based on ranking of the scores received at the exams.