As much as I like to say there is, there is no quick fix for learning how to write essays in an hour. You have to practise. You have to know the content. You have to be confident in your ability to use precise language and dynamic expression. I’ve been scouring the internet for some tips of how to approach writing essays in an hour. As you can imagine there is a plethora of information out there – but who wants to be sorting through it all? I’ll try to keep posting any that I feel will be useful.
Have a look at this article: Essay Exams
It covers a lot of information and has some pearls of wisdom. I like the section towards the end about physiological preparation. What strikes me most about this article is that it’s not saying anything your teachers haven’t been saying for years.
Hope it helps.