Registering for the ACT and SAT
The tests are given several times a year. In some states all high school juniors take standardized exams as part of state-wide testing.
In Michigan, the ACT with the Writing test is part of the Michigan Merit Exam (MME) given in March. The three-day MME includes the ACT Exam, the WorkKeys job skills assessment and Michigan standardized tests (MEAPs). Juniors in Michigan will register for this ACT exam through their schools.
After taking either the ACT or the SAT as part of a state-wide exam, you're free to re-take it on your own.
Pay particular attention to the registration deadlines!