You want to take the GRE, and think to yourself "I should take a lot of practice tests", and so you want to buy test prep books. Well, that's somewhat helpful, but you'll find that the real test, taken on the computer, feels much different.

You will have much more trouble finishing on time for the real test than you will in practice tests- particularly for the analytical section. The questions on the real test will seem harder than practice tests. You also can't go backwards, look ahead, omit questions, or sketch notes on the paper.

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