Does prep stay with you or do you need to sharpen your skills over time

I’m kind of in a dilemma. I just took the December SAT, my first one, and I screwed up bad. The reading was brutally difficult, and I messed up the answer sheet for the math no calc (guaranteed four wrong, plus perhaps the other three I didn’t erase completely) and long story short I screwed up. Luckily there’s another one in January, but I don’t know how to prep for it. I’ve exhausted my options leading up to this one. Every practice test, a full course with practice tests and classes, Khan Academy, everything. I got high 1400’s and low 1500s on the practice tests, so I really do feel like I know enough material and strategies to get a high score, it’s just that on test day a few things went wrong. So when I take it again in two months, do you think all this knowledge and strategy will stay with me or should I continue to work on it for two months? If I don’t, do you think I won’t retain my knowledge of the SAT? And if I do prep, are there any resources outside of what I mentioned to go to? Sorry for all the questions, thanks in advance for the help

If you feel satisfied with what you know about the subject matter and test strategy, you don’t need to practice with the intensity that you did when you prepared for the first test. You can do maintenance rehearsals, taking timed practice sections once or twice a week. Pay attention to what you missed and why you missed it. As for materials, try to find sections you haven’t taken before. I suspect there are a few reputable companies out there whose tests you haven’t taken. One caution: occasionally go back to College Board materials to stay familiar with their level of vocabulary and complexity. Another suggestion is to look for the rhetorical analysis questions in Kahn and College Board AP prep materials.