My class agreed that AAFP questions helped a lot. As mentioned above, really make sure you read the answers, because you will often learn essentially 3-5 diseases in one question and how to recognize said diseases. Family medicine really, really sucks for a first shelf. There was a lot of joint (septic/gout/pseudogout) and what to do next in terms of imaging (MRI/xray/physical therapy) on my shelf too, so make sure you know the criteria and treatment, too. That said, schools can't fail 30% of their students just because it's the first test, there is a curve. Study hard and you should be fine. 🙂