ap world history prep books?

i kno that the 2 main books u use to study 4 the ap test are princton review and kaplan
i was going to buy the kkaplan book online and i saw that the 2008 version is really different from the 2009 version
idoes any1 kno if the 2009 version has essay writing help like the 2008 version has?

i found it here:
2008:

http://search.barnesandnoble.com/Kaplan-AP-World-History-2008-Edition/Patrick-Whelan/e/9781419551758

2009:

http://search.barnesandnoble.com/Kaplan-AP-World-History-2009-Edition/Jennifer-Laden/e/9781419552496/

if any1 knows another book that can really help, itll b great

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