Вот что я нашла для Вас В интернете:
1.Every foreign student has the right to work in France
When working in France, whether a student or not, a minimum wage is guaranteed by law. This statutory minimum wage is commonly called the Smic (salaire minimum interprofessionnel de croissance or guaranteed minimum wage).
2. How many hours can you work on a long stay student visa in France?
Students don't need a separate work visa, because it is already included in their residence permit. They are allowed to work up to 964 hours a year (i.e., around 60% of normal working time in France).
Это только две ссылки. Погуглите, возможно, вы узнаете больше деталей.