I took exam 6 five years ago. They take off a nice chunk of points on every question for not being specific or adding something incorrect. So if you lose 0.5 points and 1 point here and there it adds up.
My first attempt at it I got a 5 and there wasn’t much I didn’t know then. My second attempt I got a 6 and thought I dominated it. It’s just a higher threshhold with partial credit.