I tend to be of the persuasion that if you need to take a test multiple times to improve your score, maybe test-taking isn’t your thing and you should move on, but when we’re talking about a potential full scholarship, I think it certainly warrants the extra effort (and expense). Some students will never improve their scores no matter how hard they try (and might even do worse the next time), but most students can and do.
Nonetheless, if you had to work extremely hard for a 30 or a 32, I’d take that into consideration when choosing my first classes and possibly even my plans for a potential major. True, some kids just choke on standardized tests, and once you’re done with them, you need never look back, but some kids with perfect high school GPAs aren’t as strong academically as they may believe compared to their college peers, and that initial 26 or 27, while a perfectly fine score, might suggest that a very technical or quantitative major could prove extremely challenging.
Just be mindful of your individual situation is all I’m saying. Better to err on the side of being too conservative in your course selections when your ability to be able to afford to attend a school is tied to maintaining a GPA-dependent scholarship.