Consider this: Information stored in our memory is retrieved using associations or retrieval cues. These retrieval cues may come in the form of associated words.
So then this would actually imply that questions in our examinations are supposed to be retrieval cues because they are associated with the content that we learn. They should prompt our memory and aid in retrieving the information stored from learning and memorising the content.
Yet it's pretty sad how many people tend to not know or forget how to do some of the questions in the exams. Of course, can't deny factors such as anxiety that may lead to a complete mind-blank.