I was shocked once by a letter written by a neurosurgeon that looked like a C+ essay in Freshman comp. But I guess it depends on where you went to school.
I have two cousins who are doctors, and I lived with one during high school. She decided to be a doctor when she was 12, and never got a grade lower than and A after that (or probably before). She helped me with my homework, and got me through my science and math classes.
She went to Vassar, graduated Summa, and then went to Harvard medical school.
She is smart, but mainly she is a really hard worker. She never procrastinates. In fact, if she had to wait to do something, like when a teacher told her she’d have to hand in a paper at the end of the semester, but didn’t give her enough information to start it right away, it’d drive her crazy.
She does have a really good memory-- so do I, and so do our fathers. But she also has a high tolerance for boredom. Her mind doesn’t wander when she has to sit in a class that doesn’t interest her that much. She could stay focused on the larger goal of “I need this class for my medical degree.” I have a great deal of trouble doing that. She also can do math. I am lousy at math. I don’t retain it the way I retain other things. She isn’t brilliant at math, in the sense that she would probably have original insights, and could have gone into math or physics, but she finds the math necessary for medical school relatively easy. She even thinks lower math, like trigonometry, is fun. I really struggled with that, and wouldn’t have passed it without her help. If fact, I wouldn’t have taken it if she hadn’t been there.
My other cousin who is a doctor is also pretty smart, but he isn’t the smartest of his siblings (that would be his sister who has a Ph.D in microbiology, and is in Texas working on the vaccine for Ebola). He has the one thing in common with my other cousin (they are on different sides of the family) that they are non-procrastinators.
I think if there’s a “trick” to med school, it’s that you can’t ever get behind.
I know in college I never missed class (hardly ever-- I missed five classes total in four years-- not days-- classes), and I did all my readings. I never had to cram, except for one physics class that was a little beyond me. I had around a 3.5 most semesters, except when I took the physics class. I learned that if I went to all my classes, I didn’t really have to study, and that was just a state university, majoring in English. I never got behind, and I never struggled.
Staying on top in med school probably takes a hella lot more work, but if you do it, then you make it, and my cousins never get behind on anything.