Conjugation drill
The te-form, past, negative, and polite forms are where conjugation lives or dies. Each question gives you a dictionary-form word and a target form; the wrong choices are that same word conjugated by the wrong rule, so you have to actually know whether it is a godan or ichidan verb.
JLPT level
Focus
Pick the correctly conjugated form. The wrong answers are the same word mis-conjugated, so it drills the godan/ichidan distinction. Misses feed your review queue.