My kids were able to take some SAT test prep course through their school (partially funded by the PTA) and it helped a lot. They wrote a bunch of practice exams and each time their scores went up. Also, test taking itself is a skill and the more you practice it the better you get at it. If you’ve written the SAT 15 times over the past 2 years, then the 16th time won’t be as stressful and you will know strategies that work and the questions will be familiar.

If you are in a school that doesn’t have a well funded PTA, you are at a disadvantage.