Test-takers have the option to complete the online exam at home or in person at an official testing center.

Lydia Gonzalez, 46, uses the computer to study geometry for the GED math test at the computer lab of the Metropolitan Adult Education Program (MetroED) in San Jose, Calif. on Tuesday, July 2, 2013 ...

The four-part practice test that includes science, math, social studies and language arts normally costs $24, and the GED itself costs $150.