Normally a question in this type of exam will ask something like: ‘Explain how you will perform/direct the role of… in three section of the play to convey…’. so a good structure would be as follows:
Opening sentence must state your answer to the question. E.g. 'When playing the role of …, I will convey … to the audience'.
Second part of opening paragraph – The WHY section. This is covered by describing the FUNCTION of the character in the play. There are three aspects to this:
Following that you would move onto the main body of your essay.
You can pre-learn the bulk of this information so happy revising!