Is there really a difference in different editions of AP exam prep books?

Julia

New member
I'm going to start studying to take the psychology (and maybe either art history or macroeconomics as well) AP exam in May of 2012. I don't have a class so I have to prepare all on my own. But AP prep books are usually pretty expensive, unless you buy older editions. Is there that much of a difference besides slightly updated material in the newer editions? Could I get a good score by studying older editions?
Also, if you could give me some examples such as Barron's AP, Kaplan AP, 5 Steps to a 5, etc. for ones you have used and succeeded with, that'd be very helpful.
Thanks!
 
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