First blush of confidence was likely unwarranted.
After work and school yesterday evening, I opened my A&P book to study, and immediately found at least 5 things I got utterly wrong on the test. That was my score down to a 90% right there, and several of those had been things of which I'd been fairly certain.
Time to change study methods, I think. More re-reading for one thing. I've been reading the text through, maybe not entirely grasping things and then spending the remainder of my time with my notes and the voluminous study materials, with frequent referring back to the text.
This is exhausting, but if other people have done it, I can do it.