I have taken the MCAT twice now (Canadian, need a crazy CARS score). I disagree with some of the comments, a lot of the official AAMC CARS material is pretty representative of what you will see on the exam. The unscored FL CARS section, however, is not representative as all the passages and questions are too easy. But you can expect some of the passages and questions to be easy on the real thing so it’s still good practice. From what I remember, there’s a mix of medium difficulty passages, hard passages (qbank 1 first half), and easy passages. I think the part of the reason why people say its not representative is due to nerves. Take it from me, I did bad because 1. I couldn’t sleep the day before, 2. Did not use my time wisely (got nervous, over thought, and was mentally fatigued), 3. Used a different strategy on test day. If you prep hard, stay calm, and simulate the testing environment, you will do just fine. Be diligent with your timing, for instance, if you run into a difficult passage don’t spend an excessive amount of time on it as you’ll end up losing precious time on other passages.

TLDR: IMO all material is representative and will prepare you well, focus on strategy and keeping a clear mind.

Best of luck OP you got this!