The ACT can be taken no more than 12 times. However, most students take the ACT twice, once as a junior and once as a senior.
ACT reports that 57 percent of students who take the ACT a second time improve their scores. Another 21 percent of students have no change in their scores, and 22 percent see a decrease in their scores. The student determines which test score he wants sent to colleges and universities.
All four-year colleges in the United States accept both the ACT and the SAT. Many students take both tests and determine which test they perform better on, then send the results of that test on to colleges. The ACT does not allow students to combine subject scores from different test dates. Thus, students typically send their highest composite score to colleges.
Colleges use ACT results in a number of different ways, including admissions decisions, course placement, academic advising and scholarships. Colleges use SAT and ACT scores as a predictor of student success in college. However, most colleges agree that a student's high school grade point average is the best indicator of future academic success. High schools use ACT results to evaluate the effectiveness of the teacher's instruction, and to identify students who need extra attention.