You will not have to use all of them extensively, if at all, but you will certainly need some, usually most of them. The lists below show you how and where you need the knowledge of language as system for the Language Issues section of the exam paper. It is not necessarily exhaustive. See if you can add further areas of language theory which require understanding of each language level. Learn at least one of them more or less by heart.
Language acquisition is developmental and sequential.
As his or her language awareness grows, a child's utterances will be less likely to fit predictable patterns or structures. Do not force language data to fit your model. If the evidence differs from what the model predicts, say so. Contrast competence and performance . Your data are evidence of performance only.