This Saturday, hundreds of thousands of U.S. high-school students will sit down to take the SAT, anxious about their performance and how it will affect their college prospects. And in a few weeks, their older peers, who took the test last year, will start hearing back from the colleges they applied to. Admitted, rejected, waitlisted? It often hinges, in no small measure, on those few hours spent taking the SAT or the ACT, the other widely used standardized test.

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