I only used the CERM. The big difference was that I took the Construction PM too. I had spent a couple years working with a general contractor so I just learned how to do estimating, scheduling, quantity take offs, etc.
I'm not really sure what resources would be needed to learn how to do this kind of stuff. A couple chapters in the CERM that I found very useful with refreshing on the scheduling was Chapter 81 (10th edition = Project Management) and for econ was chapter 85 (10th edition = Engineering Economic Analysis). The Econ chapter was a great refresher if you had to take an econ class in college.
As far as the quantity take offs / estimating portion, it's just basic algebra. You add up the quantites (make sure your units are correct <- this will make or break alot of your calcs) and multiply by the correct unit price. The AM portion of the exam gave all of the necessary data to do these calcs, you just need to be savvy to the construction slang (ie, 1 yard of concrete = 1 yd^3 = 27 ft^3). Some of these type of problems require you to read them thoroughly multiple times to make sure that you are arranging the information correctly so that it can be solved quickly. I would advise doing practice problems (I think there were a couple in the NCEES practice problems) just to get the hang of doing these calcs.