Whether you decide to self-study or enroll in a test prep course, it is important to balance studying with test taking. Taking numerous tests without focusing on weaknesses is a poor management of time. However, practicing on sample problems to hone overall ability can lead to a false sense of security, as doing so eliminates the “time stress” of test-taking under simulated test conditions. It’s satisfying to keep doing the problems you get right, but that isn’t a good use of your time; you need to pick up as many additional points as you can, and that means spending your energy on the ones you miss during your prep and your practice tests, and understanding why you got them wrong. It is imperative to find and study questions that have been used in previous exams to simulate actual test conditions. While test prep companies often provide their own questions, the best questions are those previously administered by the standardized test companies. You can also buy books of previous tests and sample test problems—they are readily available online.