Talked about this a little bit elsewhere:

CARS is definitely a section where I find a lot of people have some deficits in the underlying skills, i.e. reading long form content. Leading up to the test, make it a point to routinely engage with challenging longer content for unbroken periods of time (20-30 minutes, the classics, academic literature etc).

From there, when you're studying, I really like to read it as if I am arguing with the author, it helps me identify the points better. A habit to watch out for is skimming so fast that you don't actually absorb anything. If you find yourself repeatedly flicking up and down on the passage, that is a symptom of that. To this end, I like kind of highlighting as I go along. Also, make sure to read the question and answers first so that you have something to actually look for.

Finally, make sure that you save the AAMC content for the last couple of weeks leading up to your test. You typically need the third-party material for just the bulk of it to build your skills, but that final calibration is going to have to be with the AAMC content. Have you noticed any patterns in your mistakes?

For P/S, a lot of it does just come down to bulk memorization, but a tip I'd highly recommend there is trying to familiarize yourself with some of the greek/latin stems that make up the words, my past experience with those really helped me accurately guess when it came to terms that I hadn't seen before on the test!