I haven't got the time to do it myself and it has been pending quite some time on my radar. But per my experience go with the greener approach. Train along with making notes at your own pace, master the lab exercises/simulator and then use any sample exams to test yourself and make sure that you are validating the answers. Don't rely on any external sources as most of the time they would have at least 30-40%  which would only complicate your exam preparation.