You need to understand the test.
You need to understand the way to pass the test.
You need to know what test you are taking.
You are going to need to be able to succinctly summarise information.
You are going to need to be able to write a very basic essay, or, a critical piece on one of the topics.
You are going to need to be able to pass a GCSE Maths examination, or, an A-Level Maths examination. Everything you need to know can be gleaned from past papers. Review them, see how they are examined, this will guide your revision.