So, the problem with medical school is that, if you don't study consistently, the material piles up and it's essentially impossible to catch up.
But honestly, if you study, actively learning for 3 hours every day, you should be fine.
Of course, some days you might need to study some more and some other days even less, but yeah, that's the idea.
Also, I think the difficulty in medical school also has to do with your own personal goals. What I mean by this, if you're a student who is dead-set ona residency such as derm, plastics, ent, ortho, etc, then you might have a lot of pressure to "be in the top".