SAT Subject Tests are high school-level tests, reflecting high school curricula. These tests indicate a student's readiness to take college-level courses in specific subject areas.
AP Exams, however, assess a student's college-level knowledge, skills and abilities, learned in the corresponding AP courses.
The College Board grouped SAT Subject Tests into five main categories: Math, Science, English, History, and Languages.
The biggest difference is that unlike the SAT, which tests general knowledge and critical reasoning, SAT Subject Tests are designed to measure knowledge in specific areas, such as biology, history, French, or math.
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