The context of a text includes several factors:
Genre – what kind of text is it and how does this colour the kind of language that can be used?
Audience – for whom was this text produced? What assumptions does the producer of the text make about the audience? Again, how is this evidenced in the language?
Purpose – what are the purposes of this text (there’s very rarely only one) What in the language tells you these are the purposes?
Mode – how is this text received? What are the mode factors?
Writing about context at A Level requires more subtlety and precision than GCSE. For example, a broadsheet article may indeed be intended for ‘an educated audience’, but if it’s a piece seeking to persuade people to buy organic fruit and veg, it assumes that its audience doesn’t already, and that they care about the issues the article raises. You will gain more marks for showing how these factors affect the language chosen, than for simply stating them.