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