PBS sells workbooks for the GED, but the television station also has shows that help students study for the exam. Watch the episodes or record them. See Resources for a link to the PBS website to find out when the shows are on your local PBS channel. Besides the free television shows, you can register at PBS Literacy Link and find practice tests and quizzes. There are also "learning modules" that revolve around each subject of the GED test.
McGraw Hill publishes five books that prepare students for each area of the GED. There is a website for each subject area that is a supplement to the books. You don't need to buy the books to use the information available on the websites. Each site has practice tests, reviews each chapter of the book and has flashcards with questions. The sites are GEDScience.com, GEDMath.com, GEDReading.com, GEDSocialStudies.com and GEDWriting.com.
Steck Vaughn sells workbooks for students preparing for the GED. The free GED tool Steck Vaughn has is a practice test that mimics the real thing. The test can be taken in English or Spanish. After taking the test, you will have an idea of what areas you need more work. Study some more and then try taking the test again.
If you prefer to learn in a classroom setting, you can take GED preparation courses. Nearly every state has these programs at community colleges or learning centers. The programs are generally free, but might require purchasing books. Many students can work one-on-one with a tutor or in small groups. Check the Resources section for a link to the American Council on Education (ACE) and a list of links to GED preparation programs by state.
Visit your local library for free GED tools. Many libraries carry workbooks that can be checked out for free. You can't write in the books, but you can use separate paper to do the practice quizzes and tests that are in the books. Check the information board for any local study groups or GED preparation courses that are available in your area.