Accommodations must be approved by the College Board's Services for Students with Disabilities for students taking the SAT (as well as other College Board tests including, but not limited to, the PSAT/NMSQT, PSAT 10, SAT Subject Tests, and AP Exams). Scores will be cancelled if accommodations are used without College Board approval.
It can take up to 7 weeks for accommodations to be approved. If you plan to take the SAT in October, for instance, talk to your counselor to start the process in the spring of the previous school year—well before summer break. See the SSD calendar for all test dates and deadlines.