I would echo the read the question and understand the question before you answer it.
Do your revision for the exam, you should know the areas that you are going to cover so make sure you are in touch with the right sections of your notes and reference books to keep it fresh in your mind.
Remember that the exam is not a spelling or writing test so do not worry too much about these aspects just make sure it is comprehensible and correct.
Answer the questions you are sure of first as then you will have the best chance of building up marks.
If you spend an hour getting it wrong on a complicated question and do not answer ten other simple questions then you will be losing out.
Do not waste time waffling in the question just get down the information required in the format required. Short and to the point. But do cover all that the questions asks.
Good luck.