St. Mary’s Dominican High School junior Elizabeth Champagne earned the highest possible ACT composite score of 36.
On average, less than one-tenth of 1 percent of students who take the ACT earn the top score. Among test-takers in the high school graduating class of 2015, only 1,598 of more than 1.92 million students earned an ACT composite score of 36.
The ACT consists of tests in English, mathematics, reading and science. Each test is scored on a scale of 1-36, and a student’s composite score is the average of the four test scores. Some students also take the optional ACT writing test, but the score for that test is reported separately and is not included within the ACT composite score.