Examiners are looking to reward what you say about the craft of the writer, not the number of technical terms referenced in your response. You do not need to display a knowledge of literary and linguistic methods, but are best advised to use simpler terminology (if any) to focus and build your argument.
Rather than highlighting literary and linguistic methods, you can instead focus on characterisation, structure and plot development. For example, the use of the conch shell as a symbol could be explored as a device used by Golding to demonstrate the change in attitudes towards leadership styles on the island.