Kaplan, Sylvan, Peterson, and Princeton Review are just a few of the companies offering test prep courses for the SAT Reasoning Test or the ACT Assessment. As students aspire to get into the college or university of their choice, many resort to such courses in the hope of gaining a competitive edge by raising their scores. Although the SAT and the ACT differ in format, most test prep courses focus on test-taking strategies and skills related to writing and grammar, critical reading, and advanced algebra.