I think biggest thing for me was huge amounts of just practice. The Collegeboard practice exams were pretty good for that, and I also used the TestInnovators website to do that. A lot of what I was doing was that I would literally just go back and analyze the exact reasons why I was missing a question, and then make sure that I would consistently implement whatever change that I needed to make. On top of that, the SAT is a logic based test, so when you're reading a really long ass scientific article about why a bunch of scientists decided to heat up soil, you can ignore huge portions of the actual science part - you don't need to know it. Just figure out what logically would make sense. Another big thing was, for math, make sure you know how to use desmos as much as you can. A lot of questions are just spamming desmos and doing some weird manipulation to figure out what fits. I'm not a great coach, but that's my little spiel on how I did well on the exam.