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Does anyone have experience using an outdated GRE prep book to study for the GRE? I bought 2 GRE prep books 1-2 years ago (2013 Kaplan and 2013 ETS) but didn't sign up to take the test until this year...I haven't really opened them so I'm hoping that I could save some money and just study off of the old ones. Do any of you know if this would be ok?