So for a 25 mark essay, being clear in your arguments is one of the most important things. You should start off with an introduction, this should include key definitions on the topic and an overview of the argument. Correct definitions throughout will pick you up easy marks. For then on you should use a paragraph per relevant argument that you have, always trying to incorporate relevant diagrams and statistics or quotes from a potential extract. Always cover both sides of the argument , finally your last paragraph should be a conclusion. The conclusion is where you sum up your evaluation of the statement, whether it be to conclude on an argument or decide on the best policy to take forward.