I'm no teacher...
...but would it not make sense to focus a little on the tricky aspects of our wonderful language during kid's early years in school? Just getting homonyms and apostrophes right will take care of half the mistakes. Reading books across a wide range of subjects, learning to infer what others are implying and standing by one's principal principles are all part of what I reckon could be done in one academic year to improve a student's lifetime English.
Sh*t. I forgot, alright? The little scrotes have to be in school to begin with. My mistake...
Paris because I bet she'll have her speech carefully proofread when she addresses the nation as the next US President. http://www.theregister.co.uk/2008/08/06/paris_runs/