Took the MCAT this time last yr, so it's been a while but figured I'd reply here because I did quite well on CARS (got a 130 on it).
Anyways, YES the only was to get good at CARS is to keep doing passages (make sure they are timed!) and going over answers/explanations. Are you struggling with timing? Or getting wrong answers? If timing is your issue, you'll be shocked how fast you can get CARS done with a month or two's worth of practice (this was my issue and I finished CARS with like 5 minutes left on my test, maybe more). If you just aren't getting the answers right, be sure to read the explanations and note what TYPE of questions you are getting wrong. You'll notice a pattern in the explanations and will eventually develop an instinct on how to automatically mark out wrong answers. Also, you may notice that you can breeze through some times of passages (like natural sciences or political ones) but struggle in others (like philosophy or art). I'd suggest skipping those (once you figure out which ones you are weak in) and saving them for last--you'll have more time this way.
Hope this helps, good luck!