In addition to the above two posts, the point of the PE exam or SE exam, or any specific exam, is not to try to see if you can "pass" a test. Obviously you can, or you wouldnt be in a position to take the test. The point of the test is to force you to brush up on knowledge you havent used in a while, restudy the most up-to-date codes, and just become a smarter engineer.
I easily stuided 500 hours for the PE, and then 500 hours again for the SE1 & SE2. Walking out of the PE I felt I got a 100%. Maybe I didn't need to study so many topics in depth, but it did make me a smarter engineer. The same goes for the SE. I havent got my results back yet, but I feel great about it.
I would strongly encourage to study as much as you can. Statistically, the more you study, the better you'll do. At this point in your career, there is no wasted time studying... even if that question doesnt appear on your test.