Hex Hall, by Rachel Hawkins

YA- Sophie Mercer, 16, has used her witchcraft powers once too often in the outside world, and is sent to Hecate Hall, a reform school for Prodigium- children with supernatural powers. Shenanigans ensue.
 have to say, I really don't get the paranormal *thing*- and also, I am not 14, so I am *not* the target audience for this, but for all that, it was a fun and quick read.