Hi all! I have been looking for this one forever.
Starts on the train to Hogwarts. They are reading the newspaper and Harry is asking about the new (edicts I think) from the MoM where they are starting an apprentice(eros-eramos) relationship again. I remember that Hermione was with Mcgonagall, and Harry was with Snape. They had to live with the professors and IRC they had special colored robes.