depends on how comfortable you are with analysis in english, but generally
- brush up on your common literary/language/visual techniques (your metaphors, your alliteration, your anaphora, your imagery, your vectors, your allusions, etc.) and learn some higher order ones if you can (stuff like litotes, prosopopoeia, tricolons -- if these words are scaring you maybe stray away from them but if you can learn, understand, and apply them then you'll get some pretty decently sized marks)
- the eeaaasiest 'technique' ever for literally anything with words is "diction", i.e. the choice of words by the composer
- get a gist for the form and composition of a text
- e.g. if an unseen text is a poster, talk about how it, as a poster, creates meaning by appealing to a wider audience. if it's a poem, talk about how its abstract form expresses meaning.
- the questions will ask for something specific so be sure to answer in response to the question
- e.g. if the question is like "how does this text convey the nature of memory" make sure you are answering what specifically the nature of memory is - sad, poignant, confusing, etc.
- remember certain syllabus points to link back to, e.g. "anomalies in human behaviour and motivations"
these were just some off the top of my head but gl!!