Really late reply here, but I've been out of town for a bit.
My general thoughts on the 20th test:
C/P: This is my strongest section in general. My best subjects are chemistry, organic, and physics. I usually do very well on all practice sections of C/P, but I definitely felt that this C/P section was very challenging compared to the practices tests I've taken. I still hopefully did well (fingers crossed), but it was definitely harder than any C/P section I'd practiced.
CARS: I felt as though this was easy at first, but got harder, but maybe that was just me psyching myself out because I was a little behind on time, so I tried to rush near the end. There were a couple of passages in the middle that I got too bogged down on bc a couple of questions kept bothering me so I stayed on them too long. Overall, an average-ish CARS section.
B/B: The B/B on my test was very easy in my opinion. A couple of discretes messed me up, but the passages were generally easy to understand and it wasn't too bad. Overall, an easy bio section.
P/S: HOLY COW. This section was a slaughterhouse. Misguided and overconfident coming out of a successful bio section, I expected to cruise through the P/S section as I usually did pretty well on this section. Boy, was I wrong. This section was hard, ambiguous, answer choices were very similar so it was hard to pick, it was NOTHING like the practice tests I'd practiced, and it was overall a completely different beast than what I had prepared to slay. Overall, this section railed me.
I chose to score my exam, so there's not much left to do except pray that the curve is in our favor.