2003 television film directed by Annette Ernst

Over 40 years ago, Josefa left her home village in a dispute. A lot has happened in the meantime. Now she returns as a mature woman to where she is still known as a man.

Katrine is excited to be moving into her own dorm room at university, leaving her over-protected father and the memory of her breakdown behind her. Enjoying her new found freedom things soon turn ugly though as she falls foul of the local ‘in’ crowd, who start to bully her. Katrine discovers that this group were responsible for the death of the previous occupant of the room, who is now out for revenge and becomes trapped in the middle of this nightmare. Inspired by (but in no way a copy of) Candyman and Ringu, Room 205 is an effective chiller that oozes tension as it builds to its shocking climax.

This is not really a realistic movie, but you wouldn't have expected it to be realistic. Handsome actors in their mid-twenties perform as teenagers in a boarding school.
The main character is the girl Luca, dressing up as a boy (quite convincing, actually) and taking the place of a boy who prefers the career of a runaway. Chico, her new best friend, falls in love with her (after some unsuccessful sex adventures) and believes he's gay. But he's not gay, only the principal's assistant is - by the way the only teacher, apart from the mean principal, figuring at least as supporting actor. Lessons don't take place, and in fact the only activity apart from running after girls or alcohol is boxing. Luca is a great boxer, and this is useful when the mean principal is about to expel another pupil (Jo) and the Head Boy offers his vote against the expulsion provided Luca survives well a boxing match with him.
Apparently, this movie is the pilot of a series. I suppose this series will be overly successful. It has all ingredients of an average soap opera. And a hilarious story is better than an authentic one.