I stumbled upon this site researching AO positions and am glad I did. I've learned so much more here than all my previous googling on nuke ops.
Thursday I took the POSS and afterwards was led back to HR to await my score. It came back "recommend" after about 5 minutes.
Here's what I've learned (at least for the company I've applied to):
The score comes back on a scale of 1-10. If you've scored a 5 >, you're recommended; otherwise your score is "not recommend". My proctor told me that was the only information they receive.
I was also told some sections are weighted equally, while other parts of the test carry more weight.
The EEI practice tests are extremely accurate on subject and scope, so if you do well on the practicve within the allotted timeframe, the actual POSS shouldn't be much more difficult.
Here's my personal experience. Although I passed, my experience bordered on nightmarish. I have no nuclear experience and have completed some college. But it's been 10+ years since I've taken any standardized test outside of the POSS practice on EEI's website, which I only missed 3 questions on. I had an appointment and was the only person taking the test, so between sections, I had time to get chatty with my proctor. On the actual test, I did not have enough time to finish the Assembly, Tables and Graphs, or Math Usage sections. Because of this, I was really concerned about not passing, even though I knew the questions I had answered were correct. And I am so glad they were able to give me my results immediately, because I'd have gone nuts waiting for the results.
Speaking of waiting for my results, here's something interesting that I experienced, my proctor made it seem like they sent the tests out to be scored and that she wasn't sure when she'd get the results, that because I was taking the test so late in the day (2pm), the results may not come back until the next morning. She told me this after I had taken the first section (assembly) and had not completed it. This leads me to believe that if you do not answer enough questions out of even 1 section, you're automatically disqualified and will receive a not recommend.
Here's some tips:
take the EEI practice tests. Have a friend time you so you have a feel for the little amount of time alloted. They are exactly like the real test with the exception of having fewer questions.
in the math section especially, answer the easy questions first, then go back and complete the more difficult/multiple step questions
if you are skipping questions, make sure you're filling the bubble to the right question
read the questions first in the reading section, so you have an idea what you're looking for while reading
in the chart section, pay attention to where the bold line items are so you're looking at the corresponding item down the chart
use the edge of the scrap paper to line up your graph if necessary but don't do it the whole time or you will run out of time
in conversions, do all the easy ones first
in assembly, cross out the wrong answers first to narrow down what you're looking at
That's all I can think of for now. I'll post more if I can think of anything else. Good luck!