The problem with the Vandendool is that Harmony contains many rules, but this book doesn't prioritize them. So I know you're supposed to raise the leading note to the tonic, I know you're supposed to move the soprano voice in the opposite direction of the bass voice, and I know you're supposed to move each note to the nearest neighbour. But in some examples you can't do all three. So which is most important? Perhaps this is why they don't recommend doing the Conservatory exams without a teacher.