I took an SCCA competition licensing school in 2000.
This is a RACING school, and you have to show a desire to race wheel-to-wheel in order to pass.
They normally require two school weekends, but if you have previous racing experience you can ask for a waiver. I managed to get the waiver and was licensed after only one school.
They did push me extremely hard and I had to be quite aggressive. (I even hit an instructors car when he didn't see me and turned in on me)
Neither of us spun and it impressed upon the instructors that I wanted to RACE, and had the ability to handle the unexpected situation.
These schools require you to have an SCCA legal race car and equipment. You'll also need a crew to do all maintenance and prep between rounds. I didn't have time to touch the car all weekend. I went straight from track to classroom and back to track.
NASA also runs a very good HPDE (High Perf Driving Event) program. You can run a properly prepared street car and you need minimal special equipment.
Their instructors will also ride with you, as long as there is full rollover protection for both seats. (No single hoop rollbars)
Later,