I don't understand how I am supposed to structure my responses to the longest questions in the exam, can you help?

Long form answers can be difficult to get to grips with so don't worry about finding them intimidating, but hopefully I can give you a few tips that makes them seem a little less daunting. Firstly, I am going to set out the overarching structure you should try and follow. Secondly we will look at the deconstructing other arguments and highlighting your own, which draws the examiner to your unique point of view. Firstly I would say you have to understand that at this level, clarity is key. If we imagine you're looking at your essay laid out in front of you - let's say its four pages - the essay should consist of five parts. The first half of page one should be your introduction. After that you should have three points, each being a page each and then finally half a page for your conclusion. Keeping to this structure may seem rigid but I can promise you that this is how every academic paper is laid out - and your marker will expect no more.
This second part is the more difficult bit. You must now decide how to structure your paragraphs in order to have the most convincing argument. All of your points must be strongly analytical, using the evidence you have revised in order to fit into your answer as a whole. There are many different ways to answer a question at A Level in terms of what you conclude to be the 'reason for' a particular event, and the examiners have open ears. Most importantly they want to assess how skilful you are at arguing. Imagine you are a footballer trying to get a team to sign you a contract, you could show them a video of you kicking the ball around a field by yourself, doing all the best skills you could and scoring goals from every angle. This would be impressive, but probably wouldn't be enough to prove you're worth. What you would need to show is you up against opponents, who were trying to limit your ability to score goals as well as score their own. This is exactly the same with any academic argument. You can grab on to one argument a run with in isolation, like recording you doing keepy-ups in a field, or you can invite other arguments into your essay and prove why yours is better and deserving of the examiners applause. Therefore in an essay, it is always advisable to deconstruct other arguments in your first paragraph - this shows your have critically thought about and answered for other available arguments and can prove yours is superior. The positioning of this paragraph is key, it should come after your introduction. This allows you to immediately address the holes in other arguments and use the rest of the essay demonstrate how your answer is the best fit. Examiners appreciate this wider engagement and this is key to getting into the higher bands of the mark scheme.