In the 21st century, we are living in a world of tests; many important educational decisions are made based on results of tests—for example, whether or not one will receive a high school diploma, a scholarship, or an admission to a university. Test performances can be improved by appropriately using test preparation activities. Providing practice tests for the students, teaching students test-taking skills, or offering classes for students to learn particular subject matter more in depth for a test are all examples of test preparation.

Previous studies have found a statistically significant relationship between test preparation and performance on a high school graduation test. In particular, the strongest relationships are found for mathematics, where the relative effect size, phi (f) was approximately 0.25 and somewhat less ...