Hey Jon,
You can go to Barnes & Noble or Borders and buy a really good preparatory study MCAT book. I would recommend the one by Flowers & Silver (The Princeton Review). It's all you need to know, and then some. I would also recommend trying to buy some extra verbal reasoning material put out by Kaplan, TPR, Columbia and the AAMC.
Also, you are right about knowing only the basics. This is preached by everyone who has ever taught a review course. ALthough, when there are those passages that go in-depth, it's much easier for you to sift through all the stuff they throw at you and make it more coherent if you've taken a course like genetics and biochem. But again, just the basics is sufficient. Hope this helps and good luck! Ciao.