I really think they need to add one last question to the test. "Does the participant understand the test they just took?" It's clear he does not.

It's like seeing someone who's been a failing student all year, who was told they need to get a B or higher on the final to pass. Then when they manage it, they go around bragging, "Who got a decent grade on the final and doesn't have to retake the course in summer school? This guy!"

Then they point at the honor students, who were exempted from the final due to their high grades, and tease them over not even having a score for the final... so far detached from the situation that they fail to see how having no grade at all in this case is better than getting any grade.

It's worse than that. There is no "passing" the test. It's to track the rate of his dimentia's progression. They aren't really looking at whether he gets the easy answers correct. They're seeing how he reacts to the question, how quickly he answers, and if he drifts away and comparing the results over time to see how quickly he's losing his mind.