Specification

Examination specifications are changing constantly. Do visit the exam board sites.

read the suggested Pathways to the English Language Course (now outdated in parts due to syllabus changes, though the principle remains ....
read the Assessment Objectives for the English Language Course

Or see ...
Exdexcel AS GCSE in English Language (8178)
Edexcel Advanced GCSE in English Language (9178)

Or see ...
AQA GCSE A/AS English Language and Literature B