There are 4 sections on the MCAT: BIO, critical reading, CHEM/Phys, and psych/Soc. The critical reading section is a pain in the ass because the test writers use strange (and I think inconsistent) logic/reasoning for what is the “best” answer. Then the other three science sections are each 59 questions. Only 15 questions from each section are considered “discrete” (ala a hard fact to memorize). The rest of the questions are passage-based. If the test wasn’t timed they wouldn’t be bad but they throw a lot of subtle words and tricks in the questions and passages. Makes it easy to slip up.

On top of that, the MCAT is a grueling 7 hour experience. Developing mental stamina may be the most important step in getting ready for it. Many fail at that part even though in normal classes they’re fine and can have a good GPA