If you are talking about the basic GRE, I took it a long time ago. I'd been out of college for a few years so I went through a Barron's study guide. The test seemed pretty easy to me and iirc I scored in the mid 700s. If you're talking about specific career GREs, I have no experience. If I were you, I would start with a prep book, which will have several previously used tests. If you work through the book and find it really challenging, I would definitely take a prep course as well.
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