My experience in bio prep vs the real test was that bio prep focused heavily on taxonomy and evolution whereas the real test did not have any evolution questions and one question you could say was taxonomy related. That is a very small sample size, but my point is that you probably won't see a bunch of taxonomy or evolution questions and your time could be better spent mastering physiological systems, mitosis/meiosis, cellular respiration and photosynthesis, and genetics questions. Once you master those high yield topics then move on to the lesser topics.