English Literature- deciding quotes and books to use

For Contextual linking, I'm quite unsure on how to study and prepare for it. In terms I'm not sure which quotes to use, techniques of them etc.
I'm not exactly sure how many books//quotes I should have annotated for the English Literature exam. I know there are themes but I'm trying to decide which books to use and not use for the exam.

Take a scientific approach on it. When linking, I'd briefly consider how the form, structure and language compares/contrasts and go into depth regarding the contextual information. AO4 is where the majority of the marks lie.