How will I be notified if my visa in France is rejected?

Cela (now called campus france) is only responsible for evaluating your interview, giving reference opinions (directly to the embassy without telling you), not directly deciding whether your visa is passed or not. Only when you get the passport returned by the visa center can you know whether your visa has passed.

If you haven't received the notice of handing in the materials for a long time, you can send a letter to ask in the system (it usually takes a long time to reply)