Register for a class. Many local colleges and education institutions offer GED classes. Look for ones starting in your area. GED instructors know exactly what you will be tested on and how to study for those sections.
Locate books that detail the topics that will be covered in the math and English GED. If you are registered in a class, the teacher will typically teach from a specific book. You can also find GED study books in your local library or bookstore; choose those that include practice tests.
Test yourself using practice tests. Once graded, the practice tests in math and English will show your weak spots and what subtopics you should be studying. Taking the practice tests also helps you to become comfortable with the test length and format.
Work on sample problems. The more math problems and English questions you practice, the better you will know how to apply principles to solve them. Science and history are more fact-based,which requires more memorization.
Register and take the test.