I am doing machine design, and thus have not worked the depth six-minute solution problems for fluids/thermo. However, in the MD depth six-minute solutions, there are definately difficult problems and special cases. For some of these, I am really not going to worry about them at this point, especially problems that use a formula not found in MERM and only appear once or twice throughout the whole six-minute series. Concentrate on a basic approach even if the end result to some of these problems requires an off the wall formula. Imagine a slightly scaled down version of the problem.
Have you already done the NCEES sample exam? How did you do? I worked these as practice problems a few months ago, but am going to do them again this weekend as another sample exam. With my memory, it will probably seem like completely new problems. I also have the Kaplan sample exam. I may try to work it as another sample exam, even though I haven't heard good things about it.
The time is near. I absolutely cannot wait for all of this to be over. Of course passing would be great also, but I just mainly need a break. I don't know if I could go through this again. People recommend taking the week of the test easy, but i'll probably need that time for a final review. I'll try not to burn myself out though.
Best of luck on April 11th.