Attaining successful outcomes on the SAT can have profound educational and financial consequences for college-bound students. Using archival data from a private tutoring centre, we investigated variables we hypothesised to contribute to SAT score increases. Our analyses revealed significant effects of time on task and rate of SAT homework completion. Starting preparation earlier in the junior year and distributing tutoring sessions over larger intervals contributed to higher SAT score improvements. Testing effects were significant: more frequent practice tests significantly increased SAT scores. Official SAT administrations contributed more to score increases than did unofficial practice tests. Individual tutoring hours yielded greater increases than did group tutoring hours. Student characteristics such as gender, SES, or private or public school attendance were not significant. Implications for improving test preparation for students as well as directions for future research are discussed.