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Compare the scores amongst applicants in the pools of top colleges. A 2400 sits at the 99th percentile whereas the 2130 probably resides near the middle percentiles, varying greatly of course from college to college (for most of the schools the OP is looking at, a 2130 is high percentile-wise). I’m definitely not implying that the OP should not be content with his score, but it would do him a disservice to deny that increasing his SAT score by 100+ points wouldn’t serve him a great advantage for his Dartmouth application. If that’s really where OP wants to go and he wants a strong chance at it then he should go for a retake.</p>