Can yoy elaborate? What markers? Have a very hard time believing this
This is coupled by response time markers as well as success rate.
Do a bit of research on ADHD. Maybe look into mortality rates between medicated and unmedicated ADHD. Consider for a moment why stimulants are prescribed for ADHD in the first place, and not for anything else.
If you do the above and still can’t see how a simple test like this is more accurate and scientific than a subjective quiz that can be studied against, then I hate to inform you but you are not as objective a thinker as you might expect you are.