I recommend buying the flash cards from the school; they include all the critical elements for all areas of care and all your labs. I wrote my pneumonics on them as well. Very portable and only $10. Turned out to be one of my greatest study assets.
I studied for labs and care plans simultaneously. I went through my labs every day (takes a little under one hour) and also started submitting care plans to Sheri Taylor right away. Those were my two weakest areas, so I wanted to go at both of them ASAP to have plenty of time to practice.
I'll give you the advice given to me: buy the wound. It is the exact wound used at the CPNE. $40 is a small price to pay compared to $2,100 (cost of retake). The swim noodle is still great for practicing your injection station and IV push station.