Contextual references can make up an Assessment Objective on many English Literature marking schemes. It's important, however, to read through these mark schemes - as well as examiners' reports - to note the specifics of how they would like for you to include your context knowledge. If you do this, you will eventually develop a repertoire of facts which you can seamlessly weave into as many points as necessary. The mark scheme may say it would like context to be the entire basis for at least one of your points; or, alternatively, it may ask that you include context only to support a content-based point. If this is the case, linking adverbs or phrases are key. You can create a stockpile of these for your revision: phrases such as "With regards to the author's psychological motivations in including this description/event/character ..." or "Naturally, the contextual background of the author's society influences this example, as seen in ....". Because English can often be a difficult subject to revise, one surefire technique is having a list of the most relevant contextual points memorized, and mindmap ways you could include this to questions about the main characters, themes or chapters.