Some people claim that they forget a foreign language if they don't practice it regularly. For instance, people stay one year in a foreign country, learn to use the local language, but forget how to speak it when they do not practice it anymore. If short-term memory maintained through daily practice is a general phenomenon, what is the long-term usefulness of exams testing knowledge based on memory of which >90% will not be used anymore in individual future careers (e.g. BAC or university exams)?