I took a similar ADHD test. It seemed so easy and simple that I always wondered how it was actually supposed to catch me. Good to know that neurotypical people mostly likely test differently than I did.
This was part of how my ADHD was diagnosed. I did a full day of testing at a specialist center. First I had a conversation with a nurse, then a psychologist, then they had me do a similar test (but in a controlled environment and I also had face tracking and a motion sensor monitoring my movement). After the test, I was given lunch and a dose of adhd medication and about an hour break, then they had me do the test ag…
For our autism assessment a couple months ago, our therapist (whom we've been seeing for about a year at that point?) had us take one or two relatively short multiple choice assessments or the like and that was enough to diagnose us as on the spectrum. Did you know: Not all autistics struggle with eye contact? Some of us (ourselves included) are actually pretty good at it. One reason it's called a spectrum!
The previous time with our mental health professionals factored into their diagnoses, though, not just the tests. The takeaway: Book a therapist and psychiatrist both if you don't already and get those balls rolling.