Make sure that you always highlight the key words in the question before planning a piece of writing. The question has been phrased carefully in order to elicit a specific type of response from you. If you highlight or underline key words, you are less likely to forget to include those things in your answer.
If there are bullet points in the question, take care to address all of them equally. You will need to do this in order to achieve the most marks available for the answer.