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Searches U.S. federal government (1974-present), international intergovernmental (1983-present), state government and privately published documents (1981-present) that contain statistics. Many tables are available online as images or Excel files.
PISA is the OECD's Programme for International Student Assessment. Every three years it tests 15-year-old students from all over the world in reading, mathematics and science. The tests are designed to gauge how well the students master key subjects in order to be prepared for real-life situations in the adult world.