Medical school is hard.
During a typical four-year curriculum, medical students are inundated with literally everything that is known about every major topic in medicine and a small amount of information from a few of the more specialized and more interesting areas of medicine. For testing purposes, medical schools then expect the students to become more proficient with this material than actual practicing doctors. While this is clearly an impossible task for non-android students, a passing grade can be acquired through thoroughly studying old tests for repeated questions.
The sheer volume of information students are expected to learn borders on the absurd. For example, a typical packet of powerpoint-style notes for a four-week long subject can easily reach 600 pages of information, two-thirds of which will be lecturers' piteous attempts at being "hip". Of all the testable material in these packets, everything except the title slide is written in very dense, technical language by someone with upwards of twenty years of experience in their respective field, and every year, more and more material is added as new things are learned. Really, the only people worse off than medical students are each successive class of medical students.
If you are considering entering medical school, there are a few things you can do beforehand to make your life a little easier. Speed reading classes are often useless, but may prove beneficial for some. A faster, easier approach that results in a higher yield is faking a behavioral issue, such as attention deficit disorder. Sympathetic psychiatrists have been known to prescribe medications such as Ritalin liberally.