25 multiple-choice questions in College Board exam style. Each has four choices and a full explanation of why each option is right or wrong.
Remember what a cadential 6/4 really is. It's spelled like I but functions like V: never label it as an independent tonic chord.
Check the bass to classify a six-four. Stepwise between two chords = passing; static = neighboring; leaping within one chord = arpeggiated.
vi substitutes for tonic; iii mostly doesn't. Know why (shared tones with I) and where each typically appears.
Read the explanations even when you're right. Each one reinforces a fact that often returns in a different form on the exam.