SAT Subject Tests: Students can take up to three SAT Subject Tests on a single test date. Students must indicate which Subject Tests they plan to take when they register for a test. However, they can change which tests they take up to the test date -- except for Language Tests with Listening, including ELPT (English Language Proficiency Test). Students may only use a calculator on the Mathematics Level I and Mathematics Level 2 Subject Tests. Both Math Level I and Math Level 2 have some questions that require the use of at least a scientific calculator. Students can take these tests without using a calculator, but it may put them at a disadvantage.