Most Americans still can't find Iraq on the map.
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May I ask why? I've never heard any substantial complaints about global rankings writ large, maybe from one firm or another, but not as a general rule.
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my understanding is that there's a lot of variation in who's actually permitted to take the exams in different countries; so the sample ends up noncomparable across countries, and in many countries the test is not based on a representative sample of students
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