Son Driving. Need Advice.

I'm actually pretty mad about the driving school I chose. I paid $400+ so I wouldn't have to teach him how to drive. Not that I don't enjoy time with my son, I just don't wan't him driving my truck. Even paying that much, you get all his written stuff done and his permit, then 6 driving sessions...that can't be done all at once. They take him out for an hour then you have to drive with your kid several times after that, then they take him out again. That is not what I paid $400 for. I paid $400 for them to take a kid who doesn't know how to drive, then hand him back to me knowing how to drive. I could have taught him myself for A LOT cheaper than that. My son is doing well, but yesterday he just was not having a good driving day and I almost wanted to strangle him. Please advise.