Create essay plans. If you've been told what topics are going to come up, do at least four. Try to make them broad in case the question asks you to focus on a specific area or just a general overview of a topic.
Know your case law inside out. You won't get marks for facts but it will help you massively in understanding the principles. I always try to make links between case names and some of the facts.
You can always get extra points for critical analysis. Try to find some journal articles, consultation reports etc on the exam topics and pluck a few advantages and criticisms for as many areas as possible. Even just a sentence can make a massive difference in the quality of an essay.
Split your time accordingly. If you come to the end of the allotted time for one question, move on and come back if you have time. You're far more likely to pick up more marks starting that next question then you are finishing the one you're on.
I adopted this method and got 72% in my EU exam. Good luck!