The exam is for Kidney and Electrolytes, and the funny thing is that the dosing for people with kidney disease/kidney injury has been nailed down to a science for 95% of drugs. The class is a relic of a by-gone era, and they haven't caught up. They want you to be able to calculate dosing for some token drugs but they don't want to stream-line the teaching process either so it's a jumbled mess by some "kidney expert" who literally thinks that cutting a denominator in half increases the product of a fraction by 39%
.
tl;dr it's a poorly taught class and has almost nothing to do with practice in the real world.