There are loads of ways you can approach writing an essay, but the two I favour are detailed below.
The key thing to remember is that an essay should focus on the three AOs:
AO1: Plot and character development; AO2: Language and technique; AO3: Context
Strategy 1: Extract / Rest of play
The first strategy basically splits the essay into 3 paragraphs.
The first paragraph focuses on the extract, the second focuses on the rest of the play, the third focuses on context. Essentially, it's one AO per paragraph, for a really neatly organised essay.
Strategy 2: A structured essay with an argument
This strategy allows you to get a much higher marks as it's structured to form an argument about the whole text. Although you might think that's harder - and it's probably going to score more highly - I'd argue that it's actually easier to master. Mainly because you do most of the work before the day of the exam.
Strategy 1: Extract / Rest of play
To see some examples of these, click on the links below: