General GMAT Questions and Strategies | Re: My Review of the GMAT Official Guide 2018

I'm new to studying for the GMAT and have only used OG2017. Except for the new "never-before-seen" questions in OG2018, will many of the questions be repeats from the 2017 book? If so, is it still worth it to purchase OG2018?

I would mainly like to practice new verbal questions and am considering Verbal Review 2018, but I guess the same question as above applies.

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