there are ADHD websites that have them. I assume Mayo has their own testing system, I answered a lot of questions she was reading off her computer- it was obvious they were trying to define if actually you have ADHD, bipolar disorder or other mental illnesses so they could have the right diagnosis. And she gave me questionnaires to give to family or friends who knew me & who had experienced who I was as a concerned third party.

But the ADHD tests are all online, just google them.