None of that stops teens from driving nice during the test and then being assholes on the road. I think there's a thing in Germany for motorcyclists where you have to ride a year on a smaller cc bike before moving up to the big leagues. Something like that might help combat immature driving. They can have their ghetto blaster Hondas - with HP restrictions and limiters.
But, I live in America, land of "fuck you, I do what I want," so that would never fly.