stylistic:tone, structural:reformatting
Education

Greeks have a long tradition of valuing and investing in paideia (education), which was upheld as one of the highest societal values in the Greek and Hellenistic world. The first European institution described as a university was founded in fifth-century Constantinople and continued operating in various incarnations until the city's fall to the Ottomans in 1453. The University of Constantinople was Christian Europe's first secular institution of higher learning, and by some measures was the world's first university.

Compulsory education in Greece comprises primary schools (Δημοτικό Σχολείο, Dimotikó Scholeio) and gymnasium (Γυμνάσιο). Nursery schools (Παιδικός σταθμός, Paidikós Stathmós) are popular but not compulsory. Kindergartens (Νηπιαγωγείο, Nipiagogeío) are compulsory for any child above four. Children start primary school aged six and remain there for six years. Attendance at gymnasia starts aged 12 and lasts for three years.

Greece's post-compulsory secondary education consists of two school types: unified upper secondary schools (Γενικό Λύκειο, Genikό Lykeiό) and technical – vocational educational schools (Τεχνικά και Επαγγελματικά Εκπαιδευτήρια, "TEE"). Post-compulsory secondary education also includes vocational training institutes (Ινστιτούτα Επαγγελματικής Κατάρτισης, "IEK") which provide a formal but unclassified level of education. As they can accept both Gymnasio (lower secondary school) and Lykeio (upper secondary school) graduates, these institutes are not classified as offering a particular level of education.

According to the Framework Law (3549/2007), Public higher education "Highest Educational Institutions" (Ανώτατα Εκπαιδευτικά Ιδρύματα, Anótata Ekpaideytiká Idrýmata, "ΑΕΙ") consists of two parallel sectors:the university sector (Universities, Polytechnics, Fine Arts Schools, the Open University) and the Technological sector (Technological Education Institutions (TEI) and the School of Pedagogic and Technological Education). There are State Non-University Tertiary Institutes offering vocationally oriented courses of shorter duration (2–3 years) which operate under the authority of other Ministries. Students are admitted to these Institutes according to their performance at national level examinations taking place after completion of the third grade of Lykeio. Students over 22 may be admitted to the Hellenic Open University through a lottery.

The education system provides special kindergartens, primary, and secondary schools for people with special needs or difficulties in learning. There are specialist gymnasia and high schools offering musical, theological, and physical education.

72% of adults aged 25–64 have completed upper secondary education, which is slightly less than the OECD average of 74%. The average Greek pupil scored 458 in reading literacy, maths and science in the OECD's 2015 Programme for International Student Assessment (PISA). This is lower than the OECD average of 486. Girls outperformed boys by 15 points, much more than the average OECD gap of 2.