GCSE Edexcel GCSE BWatch
For the overall paragraph structure, they're PIL structures:
Link back to Q, you must do this to get good marks
3 PIL paragraphs, with an intro giving a brief overview of the topic, and a conclusion giving your judgement, e.g. The evidence suggests that the main reason as to why Galen's teachings on the four humours continued to be so important in the treatment of illness until the 18th Century is that the Roman Catholic Chruch promoted his ideas. this is because.....
4 PIL paragraphs, but with an argument this time, so the q might be something like: "Public Health improved after 1840 due to the work of Edwin Chadwick" Do you agree, explain. And your first point might agree: Public Health improved after 1840 due to Edwin Chadwick's report, published in 1842. And then you'd explain why you think this, giving evidence. and then link back to q, and then for the next paragraph, you'd do one against, giving another factor for it, such as the government - Public Health Acts, Great Stink which led to stone sewers from Bazalgette. and then 3rd para for Chadwick, using another piece of evidence, and then 4th para against again.
Then you have an intro and a conclusion. The intro in this example would explain BRIEFLY who Chadwick was, and what he did. The conclusion, would be something like: The evidence suggests that there were other factors involved which improved Public Health after 1840, such as the government which introduced the NHS and this improved public health by....
REMEMBER to plan before you write, and also check SPaG, and also only include info about the time period, if it says in the question about Public Health in the 20th Century, only include stuff about 20th Century Public health, not before or after, unless it says so. I know this sounds so simple, but its what drops marks apparently.
Hope I could help, and good luck for tomorrow!