How can an adult with a learning disability get accommodated to take the GED?

You may need a current diagnosis in order to take the test with accommodations. The following articles have information about educational testing for adults:

Contact the national office of the General Educational Development Testing Service (GEDTS) to find your local GED Testing Center. Information on how to request accommodations is available in a downloadable brochure called Tips for Candidates with Disabilities, which provides information for people who wish to take the GED test. The brochure lists accommodations available for people with disabilities and provides information on how to request them. Specific forms are available for people with learning and other cognitive disabilities and for people with ADHD:

There are several national organizations that can help you through this process and provide referrals to local professionals. You might want to contact the International Dyslexia Association or the Learning Disabilities Association. In addition, you can look in your local phone book for "educational testing" or "psycho-educational testing".