Some 65% of socio-economically advantaged students reported that they know well or have often heard of the concept of quadratic function, on average across OECD countries; but only 43% of disadvantaged students so reported. On average across OECD countries, the 20% of students who are most...

On average across OECD countries, students’ belief that they can solve mathematics problems (mathematics self-efficacy) is associated with a difference of 49 score points in mathematics – the equivalent of one year of school. There is a strong connection between how confident students feel...