Generally, there are several ways to get a high school diploma:Going to school regularly during the day. Going to school at night then taking a GED test. Taking mail order/ internet high school courses. Studying on your own and taking the GED test. Take a high school equivalency test through a high school or local board of education and pass it. These are offered at some online high schools. Proving to college administrators that you have life experience and skills learned at work via taking tests which give you credits for college. As an adult, you can possibly enroll in high school with normal students, take night classes, correspondence courses at home or simply study on your own and take the GED tests. Check with the Continuing Education Office of your local Department of Education. A little known way to get your high school diploma is through the National External Diploma Program which doesn't involve any direct instruction.