Why the preposition isn't guessable from English, the rough à/de/direct tendencies (useful but not reliable), the "same verb, different preposition" pairs that show up across Groups B and C, other ways to practice beyond the drill, and a full compare-and-contrast reference table for all 232 verbs by category and group. Worth a read whenever the drill itself feels demotivating rather than just hard.
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Want to go deeper than this sheet covers?
Le Rouleau des prépositions (Government of Canada Translation Bureau) is a free, comprehensive reference covering every preposition a French verb, adjective, or adverb can take — French only, no frequency guidance, so it's best used to look up one specific word rather than to study from directly.