counsellingresource.com/quizzes/adhd-testing/adhd/
I've done this quiz which is meant to provide an estimate of whether you might have ADHD. It shouldn't be used for diagnosis, there are lot of caveats for it.
But I am thinking "but surely everyone does that" about a lot of the questions. I'd be really interested to get a range of answers from a range of people, if anyone is willing to share.
For what it's worth, I've done it twice on different days, scored 76 and 62. Their threshold for "possible ADHD" is 70+. I don't really believe anyone can score less than 50 and I'd be fascinated to know if I'm wrong.