Worries over cheating on the SAT college-entrance exam by students in Asia are raising fresh questions about the test’s security as the number of foreign applicants to American universities surges.

Students and test-prep advisers say it is becoming easier than ever for foreign students to game the test, with answers becoming available ahead of the exams, especially in Asia. The nonprofit College Board, which runs the SAT, has delayed thousands of scores in Asia this school year as it investigates.

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