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I would not recommend World History if you have taken United States History for a year at some point. But if you think you're strong at it, go ahead. 640 is a very respectable score. I don't see anything wrong with that.
For the curve, WH isn't as generous as the U.S. Because comparing the World to the U.S, you can make about 8-15 mistakes on the U.S and still end up near a perfect score. I'm unsure about the the World History's curve, but I think it's less lenient.
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