First rule is that board prep is 100% not the time to learn all the things you missed in a pediatrics residency (every place has knowledge gaps that they can't help). There's too much information to review already to waste time going over minutia in depth unless it is an item that continually shows up in your review questions across multiple sources (eg multiple years of PREP and in MedStudy). For that reason, Laughing + PREP can be sufficient for many people with UpToDate being a more relevant resource than MedStudy to fill in the blanks.
Second rule is that passing the ABP boards =\= being a good pediatrician in 2019. There's simply far less need for the sort of rote memorization of volumes and volumes of information when things are more readily available. So what you would do on the exam does not dictate what you should do in real life. This is part of the reason why MOCA-Peds was started for the recertifying process
Third rule, while it's generally thrown about as super useful, without a really good plan on how to attack it, Zitelli's is a waste of money and time. Most of the advice I got related to it was to look through it for the pictures, but for me that wasn't any where close to a proper way to retain anything.
LYW is the highest yield use of your time in my opinion, in part because it points out common tricks the test makers throw in on the regular. For example, they frequently use lab interpretation questions where the correct answer is "lab error" and without knowing that was the case, I know I would have been extremely reluctant to choose that as an answer. Instead, I was prepared, double checked to make sure that made sense as an answer and was able to quickly move onto the next question. Little pointers like that help to maximize your time.
PBR didn't exist when I was going through initial certification in 2012
