As always, first impressions count, so make sure you make a good one! If the marker thinks that you are on to it from the beginning of the test, they are more likely to carry on marking you well throughout! Although many exam papers are split into sections and marked by the lecturer (or his/her assistants) who taught you that part of the course, it is never going to hurt starting off with a good answer to a question that you really feel like you know well (if your paper allows for this). This will give you a confidence boost and get you in the right frame of mind to be answering the more difficult questions, or those which you are less sure about. Make sure you keep an eye on the time while you’re doing this though, because one excellent answer is seldom going to compensate for other rushed and/or incomplete ones.
After years at University we can safely say that this is one of the most important things to get you great marks in an exam!
When you put down a word on paper the marker knows what it means, and it seems (based on anecdotal evidence) they will assume you do too. The trick is to make sure that you are confident in what you are saying. Make sure that it sounds plausible and if you are not sure of the precise meaning of the word either avoid using it completely or use it in a loose context.
Use every possible opportunity to put in a key word, because the marker will then know you are on the right track. You could describe something perfectly but if you miss out on a key word you may get few or no marks. They know what they are looking for and want to see that you know it. They want to give you marks so make it easy on them!
Keep this in mind and try to incorporate this into your study.