Play any excerpt — from the listening library or anywhere — and tap what you hear. Each choice drops into your listening map and nudges you toward the Area of Study it belongs to. Finish by naming the period/AoS and saying why. Do it often and you won't need the page — the routine becomes the reflex.
How the real exam marks a "describe" question: one mark for each accurate, specific feature — so pack in as many precise observations as you can, and pair the feature with its effect ("…vibrato, for expressive effect"). Vague answers score little; "detailed" earns full marks.
Sitting the paper soon? Read How to answer the Listening paper — the full exam method, the four playings, and the free marks you can't lose.