I hear you on only prepping for stuff that will be covered in the practice problems...when thinking about the book as a prep for the exam. What I think, is that the book may cover things not worked in the practice problems because it is a reference many engineers use in the workplace and not just to study for the exam.
I'm guessing here, but I think the practice problems are to focus on exam related questions, and from the chapters I've worked there are definitely some topics in the MERM that do not have related problems to in the practice problems book.
Yeah, I got a "b" in fluids, understood it enough when I took the class, but it just didn't stick with me.
At this point I'm planning to finish the section I am working on, and start focusing on the MS related sections for my afternoon. I feel so far behind, I honestly feel I am going to try my best on the exam, but won't be too surprised if I do fail it the first time/this time. If that happens I will just chalk it up to getting a feel for the exam, and start prepping for April...maybe shell out for a review course.