For the reading passages, always make sure to double check to see if there's any concrete textual evidence that supports your answer. You'd be surprised how many people forget - don't be tempted to put down an answer b/c it sounds right or it makes sense, only bubble in the little letter if you can point to a line or a passage that supports it.
This is time consuming though, so I wouldn't advise you to do that for every question as you're working through the test. How I work through sections is I'll speed through all the questions first, and then go back to check as many questions as I can during the however much time I have left, without paying attention to the clock at all. But that's sort of risky and may not work for everyone? Lol, I feel like I need to disclaimer it.
And obviously, memorizing vocab is important, but it's not like you have much time for that now haha
I will say that you'll probably be waiting outside the building for a little while, so bring a vocab list or something. Come up with mnemonics for the words you don't know while you're waiting in line.
Oh and in general, guess on the questions you don't know. No one believes me about this, but it's so worth it. First of all, skipping questions screws with your head and makes you underconfident about your answers. Once you skip one question, you're tempted to skip more and more, even if you actually don't need to.
And when you get a question wrong, that's -1/4 point. So let's say you answer 5 questions randomly, you'd (by probability) get 1 right, and 4 wrong. That's +1 point and -1 point. Which makes 0 points. So it's the same outcome as if you skipped all 5 questions. It doesn't hurt you at all to guess, even if you're completely clueless (and you're almost never entirely clueless). Answer all the questions.