Never used it (too expensive for schools, and targeted toward clinic use, anyway), but there is this:

http://www.pearsonclinical.com/psychology/products/100000942/quotient-adhd-test.html#tab-details

There's lots of promotional material at the Quotient-ADHD website, but most of it requires you to leave some marketing contact info. The overview video at the bottom of the above page is open.

...pronounced like the long vowel and first letter of the alphabet...