The official GED Test Center for the area is located at the Adult Basic Education Center on the third floor of the Lyon County Government Center, 607 West Main, Marshall, MN 56258. Telephone number: 507-537-7046; Email address: marshallabe@starpoint.net An applicant must be at least age 19 and a resident of Minnesota. An age waiver is required for persons under 19. Age waiver forms are available at your local ABE Center.