I found that the exam simulators were incredibly useful, especially if you simulate test conditions (max 4 hours, no interruptions, no books to help, and using a brain dump sheet at the beginning). They do give an idea of what to expect in the test. However, the actual exam was harder than the test, so be careful if you want to do two passes.
The way I approached it was if I could not answer a question in 2 minutes I guessed an answer and marked it for review.
The reason I guessed was if I ran out of time I still had a chance of getting it right.
The calculation questions are not the hardest, as long as you know the formula and can use the computer's calculator you will get them. It is the touchy feely questions that you have to answer what would be the best thing to do, or what would be the next thing to do.