1) Go over marking schemes extensively (like I mean verbatim here )
2) Remember the SEE rule (state, explain, example)
3) Know how many answers you should be giving on a question (this is hard enough to tell on the day butttt) if a question has a part I and II and is weighed at 25 marks then it is safe to assume I is worth 5 marks and II is worth 20. From this, we can assume we should provide 4 answers/examples to the question with each answer being worth 5 marks.
TL;DR: Make sure to provide examples in your answers and answer as much as you know to a question