I took the Civil/Structural this past April and (thankfully) passed. To be honest, I didn't look at either the SERM or the Structural Depth, although I did have an older copy of the SERM available for the test. I studied from the CERM structural sections, which were pretty good for concrete, but awful for steel. This is, of course, before the CERM11 came out, but after the codes changed on the exam.
The NCEES example problems and solutions were by far the closest you'll get to an actual exam question, so I went through this book multiple times before the test. I never did wood design before, so I studied the NDS code and the example problem book that comes with the code set. I did do a large number of the six-minute solutions, but of an older edition.
On a side note, the online "the other board" exam cafe was awful... a great waste of the 30+/- bucks it cost.
I'm getting my SERM (4th ed) very soon (to start preparing for the SE1); I'll flip through it and post comments.