BRS is pretty thorough. There is a mini-textbook by Bernstein and Shelov if you have the time. Some people like blueprints and first exposure, but I don't think those are as good as the BRS if you want to be thorough. The Peds shelf is a lot of diagnoses, they test you more on the stuff that is purely pediatrics as opposed to stuff which could just as easily be tested on the im shelf. They'll throw in a lot of outpatient stuff, ear infections and developmental stuff. From my experience there isn't as much fluid/nutrition management as you would expect based on how much it is discussed on the wards.
Took the test a week ago, no idea how I did. Not expecting to blow it out of the water but I'd be thrilled if I improved on my last shelf (baby steps!).
Read through Blueprints at some point during the rotation (it was a blur) but moved onto Casefiles at the end and referred back to Blueprints. Did most of Pretest (except a couple of chapters) and skimmed through a good amount of Appleton but didn't really spend too much time on it. The test is challenging and I definitely did my fair share of guessing. We'll see how I did on it- I'll comment more when I get my score back and can tell you what worked and what didn't