In preparation, I would recommend doing all of the problems in the Lindeburg practice exam, but don't time yourself. Try to do each problem without looking at the solution. I would certainly recommend taking the NCEES exam like a practice exam. Do it a few weeks before the actual exam. Set yourself up in a room on a hard chair with the snacks you plan on having at the exam (if they're allowed in your state). If you plan on using ear plugs during the exam (which I recommend), do the practice exam with the ear plugs in. Already have your reference books tabbed. Set the timer and don't allow any distractions from family or the phone. Try to avoid looking at any of the problems ahead of time.
I took the Lindeburg as a practice exam 2 weeks before the test. I got a 34%. I was discouraged and extremely upset and studied each problem individually. I ordered all of the 6-minute solution books and started working each problem in the breadth section.
I took the NCEES as a practice exam 1 week before the test. I got a 74%. I was encouraged, but not complacent. I worked each problem individually again and continued working all of the breadth problems from the 6-minute solutions and started working the depth in my area.
I took the PE exam and got a 96. However, I really feel like I got "lucky" in the morning of the real test and got questions that were in my stronger areas.
The main thing I can say is, work as many problems as possible. The more you see something presented in different ways, the more comfortable you will be during the exam. And, speed is so important! There were some problems I spent 30 seconds on. Others, I spent 15 minutes on (although that was rare).
Good luck!