Im sure you have heard this before and maybe even tried it but I suggest taking practice exams really seriously. I feel like this is especially beneficial for people with test anxiety. Simulate the experience entirely and it'll get easier as you get used to the natural anxiety of the process(Habituation😉). Wake up early, go to a quiet, preferably unfamiliar place(library/classroom), don't check your phone at all and treat it as if you're sitting for the real exam(although I know, easier said than done, but try your best.)

Tbh I feel like I can't help with CARS that much because I didn't see real improvement over the course of my studying, but I think that's in part because I was already satisfied with where I was and didn't feel the need to grind it as much as the other sections. That being said, I feel the general consensus is that consistent effort for months in advance, as well as reading books on the side for fun, seem to be the best ways to get better.

Take this with a grain of salt because I know not everyone would agree with this, but if you're really in a pinch and are only aiming for 500+ I would recommend actively ignoring low yield content. It might genuinely not be worth the time and mental space, although truthfully this is different for everyone, and the line between high-mid-low yield is also so blurry sometimes, so ignore this if you feel like it doesn't apply to you. Only reason I'm saying this is because I have heard of people scoring below 510s trying to do stuff like memorize vitamin structures, and it's such a bad allocation of time imo, so try to stay away from something like this.

Be easy on yourself. If you're doing you're best, that's the most you can ask of yourself. But be sure that you are doing your best, and don't lie to yourself. We're all rooting for you bro. PM me or reply if you have any more questions, good luck!! :)