My experience was a bit different in that I felt that the morning session was more difficult than the afternoon session. The reason being is that most of the afternoon session questions I was able to look up and solve for out of the CERM or PE prep material from the school of PE. I also focused more on practice problems for the afternoon session as I felt more competent with water resources problems. However, I think the afternoon session required a lot of computational effort and brain power. There was a large handful of questions in both sections that I had to make an educated guess on (a few I just straight up guessed), but overall I felt more confident in the afternoon session.
I found that time was not my enemy as I relied heavily on grabbing the low hanging fruit. I skipped a lot of problems that I thought would require more time for me to work through or look up in the reference manual. I realized after skipping through problems, I had two more hours left to go back and take my time on the ones I skipped (about a third of the problems.) Of those that I skipped, I think about half of them I had to guess on. However, I felt relieved knowing that at least I solved the easy ones first.
I saw a handful of questions that were similar to ones I encountered during practice tests; however, they had small tweaks that completely threw me off.
A handful of the conceptual questions were just beyond me and I could not find any reference. Sadly, I couldn't even make an educated guess on those.
The worst part was not being able to find an answer remotely close to my calculated answer, even when I thought I knew what I was doing. Overall I feel the test was pretty brutal. Some questions I felt confident, other's just had me broken. My brain was pretty fried at the end of it. I guess we will just wait and see what happens in December.