A person whose employment is to write what another dictates, or to copy what another has written.

someone skilled in the transcription of speech (especially dictation)

a person employed to write on behalf of a candidate in an exam

a person who will write down your answers

a scribe or assistant who writes from a candidate's dictation

a writing assistant (or scribe) who writes out answers dictated by the pupil

Amanuensis is a Latin word adopted in various languages, including English, for certain persons performing a function by hand, either writing down the words of another or performing manual labour. The term is derived from a Latin expression which may be literally translated as "manual labourer".