The ACT is a standardized test administered to high school students and used to determine college admissions. The test is offered approximately six times per school year, and students are allowed to take it up to 12 times. Students often take the test more than once, and 57% of students who completed a retake improved their score. The ACT can cost about $35–$55, but financial aid is available. Students are responsible for providing the list of colleges to which they would like to submit their scores. Some schools may help their students register for the test, but if they don't, students can register online. Students may not take the test without registering first. The ACT examines math and literacy skills with an optional writing section, and the best score a student can receive is 36. Not all colleges accept the ACT; it is the student's responsibility to find out which tests their prospective college requires.

What is most likely the reason a students' score would improve on a retake?