When answering written part of questions, best is to make each point on a separate line (with a blank line between each point, so the marker does not miss any of them).
Rather than writing a heading, I think better (quicker) is to underline a key word in your point (or write the key word in capitals).
Don’t write too much – one or two lines for each point is enough. (The examiners always writes more than they expect students write.)