study for npte exam

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I am looking at October too to take my exam.. I am just wondering though see i have the 2011 therapy ed guide book and i am contemplating on buying the 2015 one.. is there a huge difference with these two editions? I hope someone here help me figure this out..
 
I am looking at October too to take my exam.. I am just wondering though see i have the 2011 therapy ed guide book and i am contemplating on buying the 2015 one.. is there a huge difference with these two editions? I hope someone here help me figure this out..

Just buy the 2015. I doubt anyone has the 2011 and 2015 to compare the issues.
 
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