The SAT Subject Test is a 1-hour long multiple-choice content-based exam. Unlike the SAT and ACT, which allow for shortcuts/strategies, the Subject Test requires that students have a strong understanding of the material.
SAT Subject Tests are used as additional criteria for admissions at highly competitive universities. Some universities also tend to use the Subject Tests as placement exams after the student has been accepted or if the student is applying for a math- or science-heavy major like engineering. Some universities – called “Test Flexible” also allow 3 SAT Subject Test scores to be submitted in lieu of one SAT or ACT score.