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1680's a decent score. National average is somewhere around 1500.
You have to look at your out-of-1600 score (the math and critical reading totalled without the writing) too. A lot of colleges don't really look at the writing yet.
Though 1680's decent (not great, but decent), I'd suggest maybe taking it again after taking a prep course or having tutoring. You could probably raise that score by a couple hundred points.