Don’t even get me started on my case study at HSF - I went very red for a person who is brown which I didn’t even think was possible
but typically, written ones are designed to be very time pressuring and people rarely ever get to even finish the whole thing. But as you’ve already picked out where you went wrong i.e the timing you will never make the same mistake again! In terms of structure, subheadings are a good shout or if it’s like a presentation, signposts to tell the audience what topic you’re moving on to helps too.