Of course, writing in the Chinese final exam is ok, but it depends on your age. If you are in primary school, the final composition belongs to narrative writing, and narrative writing can be fictional on the basis of reality, because writing focuses on your expressive ability and your language ability, rather than paying too much attention to the authenticity of the story, but the story should be expressed on the basis of reality and cannot exist outside real life. If it is a middle school, most of them are argumentative essays, and the arguments of argumentative essays cannot be fictitious, because we need to prove our arguments with real things, which is more attractive and convincing to teachers, and fictional arguments are not enough to support the contents and viewpoints of our whole composition, so it is not recommended to treat middle school compositions in a fictional way.