What happens to old test prep books after ap exams get revised?

Test Preparation AP Test Preparation
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<p>This is my first year of taking AP classes and I'm currently taking Euro and Bio. So far I bought crash course for Euro and plan to buy PR along with it. Then Barron's for Bio.</p>

<p>I just read about the change in the Euro exam for 2016 which is after mine, but my question is, do prep books become useless once the exams are revised?
I heard how brutal the Bio exam was after the change and how none of the books prepared for it. My family is tight on money, so I want to be really careful in buying the right books. If I buy the newest version of the PR book for Euro, would it be really unhelpful for the new exam? I was planning on selling to a friend along with my notes or giving it to my cousin who will also take the new one.
Should I just buy a cheaper, older version of PR? Is there much of a difference?</p>

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<p>If the test is being revamped, chances are older versions of the prep books won’t properly prepare you. You’ll need a book for the new exam. Sometimes prep books have several editions in between the time that the exam changes, so those would be fine for the current exam, but once the exam chances, might not be relevant. For example, say a test is changed in 2008. Prep book has a 2009 edition and a 2011 edition- the exam doesn’t change until 2014. If you are taking the exam in 2013, you could use both the 2009 and 2011 edition, however if you take the exam in 2015, you’d need a 2014 or 2015 edition.</p>

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<p>Ah, okay. Thanks for the the reassurance! </p>