Thank you very much for your reply. It is a relief.
If I may I would like to ask you another question. Could you tell me if you know anything about "sample contract" from the government? The school send me one of them asking me to sign it and send it back, but they never send it back signed to me.
They explained that it was a necessary document for applying for the work permit but that it wasn't the "final contract with the school".
Thank you.

Elisa