<p>My impression is that once you reach a certain level of test score, it is not worth your time to attempt improving that score. At that point you are much better off putting your time and effort into other areas of your application. Instead of wasting time preparing to re-take the ACT or SAT, work on improving your essay, do more volunteering, make an impression on those who might write your recommendations, etc.</p>
<p>A better essay can easily be worth much more than improving your SAT from 2250 to 2300.</p>