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View our work on COVID-19 vaccinationsNational average learning outcomes, 1985 vs 2015
Average scores across standardized, psychometrically-robust international and regional student achievement tests. In order to maximize coverage by country, tests
have been harmonizedand pooled across subjects (math, reading, science) and levels (primary and secondary education). The observations correspond to 1985 and
2015, or closest year available.
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