I take A-level politics, and in year 13. What I can say about politics is I am doing the new spec and so will you so I can give you advice.
First start with an introduction; the best thing you can do is summarise points you will talk about and define key terms. Do NOT spend a long time trying to perfect it, move on.
I would say have 6 paragraphs- 3 agree and 3 disagree.
Each paragraph should have a definitive arguments, it is very easy to just describe in politics, do not just describe (for example do not explain FPTP the whole paragraph – talk about its EFFECTS – things it produces – why is this a good thing or bad thing for the UK? ). Bring in arguments and opinions that links with the question. Bring in wider knowledge, bigger concepts such as democracy and participation for example. ALWAYS refer to the question each paragraph or it will look like you’re not answering it. Make sure you bring in keywords (AND EXPLAIN THEM and then refer to your argument you’re making or the question). Each paragraph should have an example or examples to back your point, this is where you use the case studies in your textbook or google some. Then you do a counter-argument. For example the first paragraph is arguing that FPTP is good for stable government, the second paragraph should be how it can stop a stable and strong government. This is true analysation, because you’re taking a concept and you’re stating different views. Make it balanced so the amount of detail for both sides should be kind of equal, then make a mini conclusion between the agree and disagree you just made. Do this for the other agree and disagree arguments throughout. Be consistent. Then do a final conclusion, summarising what you’ve said in a few lines and making a clear judgement by straight up answering yes or no to the question.
Just practise and make loads of essay plans!!! Hope it helped