Nicely Done, bb. I have been lurking around this site too, and have definitely found some useful info in prepping for the POSS. My mentality in taking this test was to work as fast as possible and skip anything that I could not do nearly instantly. With respect to individual sections, these are my comments:
Assembly:
I had difficulty visualizing about 4 of the questions. The particular issues I had with said questions were that the shapes were very irregular and the orientation of the finished assembly was dissimilar to the way the individual pieces were displayed. One tactic I found useful was to isolate a particular piece that had to be placed in a certain place/fashion. This strategy was useful for the questions that had 2 or 3 answer choices that were similar.
Mechanical:
Common sense physics with a twist. Some were difficult; most were very straightforward. I ran through this section and answered all but about 3 on my first pass. The others I had to think about because I lack both the hands-on background and schooling in subjects like fluid mechanics. My advice on this section is to know how much time you have per question and budget accordingly. You should be able to tell within about 2 seconds if you understand the concept or not. Move on to a question you know and backtrack if time permits.
Tables/Graphs:
The answers are in front of you. Spot them quickly and fill in as fast as you can. The graph section required some care because some of the graphs overlapped near the question value on the x-axis. Although I didn't use one, maybe using your scratch paper as a straight edge would help. I would not recommend a straight edge on the table section as IMO you will sacrifice too much time. I answered about 45/60 in the table section and about 70-80% of the graphs.
Reading:
I had to reread to answer a few, but crossed the finish line with about 5 minutes to spare. The longest passage we had was about 4 paragraphs, and the passages are well-organized so it is fairly simple to locate the ones you don't remember.
Math:
My strategy:
Do all single conversions and only doubles(+) that are nice and clean. I got bogged down on converting bushels to the speed of light or some such nonsense for a second, but dodged the bullet by moving on to the algebra section. There were only 2 or 3 conversions that required a lot of work. I finished all of the algebra questions and did about half of the word problems. In retrospect I wish I had done these 2 sections first, because I killed my time on one of the conversions (wasted about 25 seconds and didn't even answer it).
I prepped for the test by reviewing the suggested EEI practice material. I did the tests and checked my answers when I was first notified that I would be taking the test. About 3 days before the test date I did the practice tests again. I did not time myself either time (which I think would've helped me in the sections I did not finish). I would recommend it to get yourself adjusted to the hustle. The majority of the questions are not hard, but some require a little more thought/scratchwork than you would expect from the relative ease of the practice material. If one were inclined to time themselves taking the practice tests it might be beneficial to deliberately short yourself on time to figure in the extra 10-15 seconds for the tricky questions.
I also passed and am hoping to hear back soon for an interview. Thanks to everyone who has contributed to this site- I am a prospective newcomer to the industry, and I feel that the stories posted on this site will reduce the shellshock when I (hopefully) make the leap from commercial electrical engineering to the world of the nuke.
Also, go Pacquiao!