They've never asked a drafting question so far in ST3 (although it has appeared in old 300-series exams, albeit very rarely). I think it's possible but very unlikely. If it does appear, keep it simple - after all, it's not Subject CA3. Probably sufficient to use whole sentences, include an intro and conclution, headings, grouping your ideas, and keep the language simple. But of course this depends on your audience and what you've been asked to draft (letter, report etc).
