Which FA USMLE should I use?

[cardiodude]

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Hey guys so I'm planning on taking my step either late this year or early 2015. My question is, would I benefit from using the 2014 FA if I take the step in November or should I give it some time, wait for the 2015 edition to come out and then take the step in January? Are there usually major changes each year? I've heard people assuming its basically the same but I'd like to hear from someone who's studied and compared different versions personally. Thank you