As a high school student applying to college, I took the SAT twice. The second time I took the test, I scored several hundred points higher. Simply by taking the test once, I knew what to expect and was able to score higher on my second try. Unlike the SAT, students have only one chance to take the HSPT. This makes it that much more important that they know exactly what to expect. If a student is not able to do in-depth prep, a practice test will give him or her a chance to experience the timing and structure of the test, which will make sure there are no surprises on test day.