If you enter France on a tourist visa - can you just leave France for the weekend and come back on a long stay visa?

I will be a student in France – and I have had some problems getting together everything necessary for my long stay student visa. So I applied for a second limited passport, so I can be in France in time to start school on a tourist visa while my original passport is being processed for my long term visa. When I get my original passport with visa back, what do I need to do so I can return to France on the correct visa?