Just to chip in my thoughts, I think you can start prepping for the CARS well in advance. I think reading about strategy well in advance and then giving yourself a light schedule of practice over the long term can really help. I really disagree with the idea that "reading" randomly will just help your CARS, because the CARS requires you to synthesize your reading to answer questions in a set amount of time. Reading a NYT or Economist article doesn't allow you to test your comprehension or practice synthesizing that information and it also does not train you to move efficiently through the passage. I've worked with hundreds of students personally and I've never seen that strategy work for people.
Instead, my advice would be to find a guide you like, IMHO a pretty good was mentioned previously 🙂 and then I'd start pyramiding your passages gradually. Maybe for the first month, do one passage a day (timed of course! never, ever do a passage untimed) five days a week. The next month do two passages five days a week. Maybe the next month, jump up to 3. By then you'll have a strong base of CARS prep going into your dedicated MCAT study. If I was studying for the MCAT again, this is how I would study for CARS.
Best of luck on your MCAT and please let us know if there's anything else we can do to help you!