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Given that your math score did not change much across your first three testings, I don't think you're going to see much improvement in that area on your fourth sitting, unless there is something significant you can do that you did not do the first three times. I would only retake if you didn't study for the math section for your first three tests (or if you typically score higher on practice tests than your actual scores reflect).
But as others have pointed out, the main factor is what you're planning on studying -- you should be fine as long as you don't plan on majoring in anything math or science-related.
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