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If you think that international test scores are a valuable indicator of educational success (I don’t), you should read this article. When poverty is recognized as an important variable, the scores of U.S. students are among the best in the world.
I don’t consider international test scores to be an accurate meassure of school quality. I am persuaded by Yong Zhao’s work that high test scores may be the result of relentless test prep, which distorts education and discourages creativity.