Books for level 4- need advise

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HI,

I'm looking to purchase some books for AAT Level 4 ill be studying this September, I'm after Osborne books, the books for 2015/2016 per set are at least £19, I have seen some Kaplan books, ok prices but they are 2012/2013 some other books I have seen are 2011, so I don't know what to do, do I go with recent edition or older books.

HELP

Thanks
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