Education in Germany is primarily the responsibility of individual German states (Länder), with the federal government playing a minor role. Optional Kindergarten (nursery school) education is provided for all children between one and six years old, after which school attendance is compulsory. Overall, Germany is one of the best performing OECD countries in reading literacy, mathematics and sciences with the average student scoring 515 in the PISA Assessment Test, well above the OECD average of 497 points. Germany has a less competitive system, leading to low rates of bullying and students having a weak fear of failure but a high level of self-confidence and general happiness compared to other OECD countries like South Korea. Additionally, Germany has one of the largest percentage of top p