You have to be able to read, compute, interpret information, and express yourself in writing on a level comparable to that of 60 percent of graduating high school seniors. If you are uncertain whether you have the level of skill needed to successfully complete the tests, you can find out more about your abilities in several ways. Many programs are sponsored by local school districts, colleges, and community organizations. Teachers and tutors in these programs can tell you whether you need intensive preparation or a quick brush up.