There are a few tests on the internet that allow you to test yourself for ADHD/ADD. I think they should only be used for you to judge whether you need to see a doctor or not.

From ADD / ADHD Tests & Diagnosis: Diagnosing Attention Deficit Disorder in Children & Adults
Keep in mind that the symptoms of ADD/ADHD, such as concentration problems and hyperactivity, can be confused with other disorders and medical problems. Just because it looks like ADD/ADHD doesn’t mean it is, so getting a thorough assessment and diagnosis is important.