the son of a woman running a boarding school kills those attending it

[bob]

this movie is really long and boring up until a nice girl blonde girl gets killed at which point it turns awesome

at the end the son has made something of a college of his mother using the dead students he called his girlfriend or wife, can't remember which

[akiratubo]

Sounds like what the killer does in Pieces but that movie isn't particularly long.

[retrorussell]

Sounds kind of like The House That Screamed (1969).  Was it an older or newer film?

[Rev. Powell]

I agree with retro, it sounds like you're taking about The House that Screamed: http://www.imdb.com/title/tt0064888/. 

[bob]

I agree with retro, it sounds like you're taking about The House that Screamed: http://www.imdb.com/title/tt0064888/. 

yes, tthat describes it pefectly

thanks guys 

[SC-RM]

For those wondering,It was in fact 'The house that screamed" I showed it to him,It was horrible.