GED courses provide an opportunity for those without a high school diploma to gain important qualifications. The courses consist of modules teaching five key subjects: math, science, language, social studies, and reading. Students can study at over 3,200 colleges, adult learning centers, and public schools across the country. People can search online to find local GED centers offering courses and preparation for the certification exam. The cost varies by state but contacting the individual programs provides the most accurate information.