Definition
Achievement scores are based on assessments administered as part of the OECD PISA programme, which were carried out in 2006 (with a special focus on students' abilities in science). “Students” refers here to 15-year-olds enrolled in secondary education. “Top performers” refers to students who attain Levels 5 and 6 on the PISA science scale, Level 5 on the reading scale, and Levels 5 and 6 on the mathematics scale.
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