I'll assume you're doing AQA English Lit, in which case you're going to get a choice of 2 questions to answer. It's out of 30 marks + 4 for SPaG. It is not going to be an extract question, you have to memorise the book. It may ask you about a certain theme, or about a character and you just have to write about it. You need to make a few points, back them up with evidence, and then analyse the evidence to show how it supports your points. And then you end with a conclusion.