I notice there's a certain aura of desperation in the way NA questions are worded and it's been a pretty good heuristic for this skill builder.

I would agree that missing ~4 for a single untimed section shows a good solid foundational knowledge of every question type. However, depending on the nature of the questions you're missing, it could signal that there's still some improvement to be made. Do you notice that the questions you're missing are all beyond a specific difficulty threshold? If so, I'd recommend drilling only at and above that difficulty. As a result you'll get better at identifying correct answers choices when they're more nuanced. Also, this could remove a lot of the "brain fog" and fatigue that might be tripping you up on other questions, since the question-solving process will become more intuitive.

I did it!! My first drill where I got all right on the first try :-) My intention isn't to brag- but I want to give context that I've been REALLY struggling with reading comprehension, but after really pushing myself it's finally paying off! To everyone else who's struggling- keep pushing!! It'll pay off!!

Timing. That's what it often is for me- I miss easy questions because I spend less time and am more likely to skip a key word or misinterpret the answer I've chosen because I've been too hasty. Try to focus on not misreading things, and always drill timed.