it really depends on the school. For example, at mine the administration tweaks each test (we take all of the subjects on the same test, once every 3-4 weeks)to keep the most amount of people on the verge of failing to keep effort up. 7 people on probation after the first semester. Average of F on the pharmacology final.
Ive heard its not like this at other places.
My friend goes to a school up north who says passing is as easy as reading the slides a few times.