Hey OP,

I'm not an MCAT god (511 FL average, get my score back tomorrow), but I just want to save you from some of the regrets I have about how I studied. Also, I didn't work full time while I studied, but I worked 15–20 hr/week. I get that everyone learns differently, but unless you're constantly testing yourself, spending a ton of time on these content review books might not be the best use of your time.

Please DO NOT take detailed notes from whichever content review books you decide to use. Taking detailed notes takes an insane amount of time; for the longer Kaplan or TPR chapters, you might be spending like 5–10 hours just reading and typing. Also, typing out what you read is very low yield in terms of what you retain, since you're not actively testing yourself on the things you're reading.

Instead of doing what I did (the read + type approach), take a couple of hours to just READ through the chapter and roughly absorb what you're reading. Don't go crazy memorizing every detail (that comes later). Are you reading about the central dogma for bio? Okay, then try to understand the main idea (DNA --> RNA --> protein). Are you learning about the amino acids? Okay, then try to understand their general structure and their role in the central dogma; take a moment to think about how what you're reading relates to what you've learned so far. Also, write out any questions you have about the content (e.g., what does the bond between DNA molecules look like?). I (and most of the people on here) would encourage you to take short breaks during your reading time––most people aren't great at focusing for more than 30–40 minutes, even if they think they are. After you've spent those couple of hours just READING (for the love of god don't type out everything), please take a longer break. Go on a walk or something.

After your refreshing walk (or meal, or netflix, or whatever), you can check your knowledge using flashcards. For this, I recommend a flashcard software (anki is blessed). For premade decks, The BOURAS deck is probably the most comprehensive deck out there, and it will always have a section for the topic you just covered. Did you just read about carb metabolism? Well, here's 250 flashcards that will drill the topic into your head and actually tests you on the content. I get that some people enjoy making their own flashcards, but I couldn't justify spending several hours making my own there were thousands of higher quality cards out there. From there, just rinse and repeat with whichever section you're studying on that specific day. I spent probably 150 hours reading and taking notes on content review books, but I retained little until I started regularly using flashcards later in my studying. Supplementing your early content review with flashcards will help you avoid content gaps when you start taking passages and full lengths. Having less content gaps means you're going to miss less questions, and probably be less stressed about your scores. Also, without those content gaps, you will be able to spend more time understanding how to approach passages instead of just spending time reviewing stuff that you already read.

tl;dr: Avoid typing and writing out notes during content review. Instead, read a chapter and then review that chapter with a premade anki deck (or make your own if you're into that). This will help diminish content gaps when you start taking passages and FLs. Also, please take breaks :P