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@7edu-Dr. Jing:
Option 1: The SAT or the ACT, as well as two SAT Subject Tests: one in math (level 1 or 2), and one in science (physics, chemistry, or biology e/m).
Option 2: The TOEFL (we do not accept IELTS) as well as two SAT Subject Tests: one in math (level 1 or 2) and one in science (physics, chemistry, or biology e/m). This option is especially recommended for students who do not speak English at home or in school, or who have been speaking English for fewer than five years.