Just know your content really well, especially dates. You should first consolidate your knowledge on whatever country you're doing, write a practise essay with your notes in front of you first, and then once you're confident enough write a bunch without them, and get feedback!!! Memorising a whole essay is very taxing with little reward, esp with modern cause the question could literally be any syllabus dotpoint, so just work on honing in your writing skills. You seem like you're in a good position tho so I wouldn't worry too much