I'll throw my hat into the ring here.
There was an American series (short-lived, but able to sneak out a complete series DVD boxed set) called UNDECLARED. It's of recent vintage, and although it's a comedy, it still maintained enoug hcredibility that it could work. Going by a few visits to Shanghai a couple of years ago, I suspect it might be available on the China pirate sector.
What about REAL GENIUS? Not so realistic, but that springs to mind.
While a product of the late-eighties/early-nineties, HOW I GOT INTO COLLEGE is both a sincere, sweet little comedy, but reflects the anxieties over SATS, getting into the university one desires, and the universal anxiety one faces when they realize it's time to decide which path to take as an adult.
While bleak and not a great film, John Singleton's HIGHER LEARNING offers up serious topics that many young people face when entering the university system. Social problems, in particular, are the crux of this film.
Then there's a few I proably wouldn't show in class, but would offer up as suggestions to mature students:
THE RULES OF ATTRACTION, based upon the Brett Easton Ellis novel, and while satirical (ala black comedy) I found its take on some fascets of undergraduate life to be spot-on.
STORYTELLING is another.
Come to think of it, HIGHER LEARNING would be more appropriate here, than as a general presentation.
Those spring to mind as having some immediacy.
If it was more about college experiences through the ages or with an emphasis on entertainment then ANIMAL HOUSE, P. C. U., National Lampoon's DORM DAZE, FRATERNITY ROW, ROAD TRIP, OLD SCHOOL, DEAD MAN ON CAMPUS, R. P. M., DRIVE, HE SAID, and THE STRAWBERRY STATEMENT, and the Canadian aniamted series UNDERGRADS. However, I don't think any of them would be appropriate for class presentation. More on a personal recommendation thing...
If anyone is focused on high school then I offer up the following suggestions:
STAND AND DELIVER, DEGRASSI HIGH (a television series released as DVD boxed sets in Canada and America, so possibly lurking on the Chinese underground), MY SO-CALLED LIFE (same stats I mentioned for DEGRASSI), THE WONDER YEARS (a long shot, since I think only the first season has been announced for a boxed set - and its not until season 4 that its protagonist enters high school, so I guess this is more of a name-check suggestion than anything practical), the film adaptation of THE CHOCOLATE WAR, SCHOOL TIES, ELEPHANT, and Frederick Wiseman's documentaries HIGH SCHOOL and HIGH SCHOOL II