you don't need a driving school if you local SCCA or Autocross clubs.
For $50 you can get an instructor driving with you showing you the ropes.
After a two or three weekends you will have learned nearly as much as you
would in one those formal driving schools that cost thousands of dollars and
are only a couple of days long. Nobody learns in two days.
If after at lealst half a dozen autocross events you want some in depth instruction
look into spending the grande dollars.
check this out maybe some are close to you
http://www.myautoevents.com/pls/mae/frmEventList.Show?pstext=autocross&psstate_province=nc&psrnd=.72059533676417466846326134354050418874