I have prepped for GRE twice (meaning, my first exam scores expired after 5 or so years, and I had to take it again).
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First: For the math part: do all the practice tests in the books, you start to recognize types of problems.Learn some of the math tricks they give you in the book. But, remember, there is no advanced math, just a lot of tricks. For the verbal part, make up flashcards with all the GRE vocab words you can get your hands on. Far and away, it is the vocab that makes this section "hard." Carry the cards with you all the time and practice them while you're at a stoplight, or any down moment you might have.
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Second: Once you have a good grasp on the vocab, start taking the paper verbal practice problems. See how you are doing. The best way to do them is to break it down into whether you are looking for a synonym, an antonym, or an analogy. It's always only one of those three. For analogies, make up a simple sentence that describes the relationship, and then apply it to the possible choices (e.g., a sponge is used for washing). If you need to practice more vocab, hold off on practice problems and do more flashcards. Keep practicing math problems. Do practice essays. Are you a good writer? There are some pretty standard ways to approach the different essay types. Start intro from broad opening in first para. to specific statement of what you are arguing in last para. Next 3-5 paragraphs present your case, each focused with an (or various) example. Last paragraph states conclusion, from specific in first sentence to broader implications in last sentence.
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Last: start doing the computer based practice exams. This is the closest to the real thing.
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For me, I did little practicing of the essay, just about 3-4, but that was enough. I spent a ton of time practicing the math and verbal, though!
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Between first time and second time, I improved my verbal score by 100 points! And, all of that is because of the vocab and flashcards (the only thing I did different, really!
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Good luck!!