I have key words that I start with, to fill in the connections between phrases/sentences, and I also try to focus on the opening paragraph as much as possible, as later paragraphs can take you into completely different areas or subjects. E.g. in the one that was about Scotland, and Edinburgh being the capital, there was a paragraph later on about the percentage of the population that was from an ethnic background - so I went all round the houses guessing South East Asian countries for ages!