I'm not so sure - assuming the (pre-)teens aren't actually driving now, the "fake driving" could instill all sorts of bad habits that must be unlearned before they can learn to drive safely, and successfully unlearning something is often far more challenging than learning it in the first place.
I suppose the car could set off alarms whenever it corrects the student driver, providing constant negative feedback for poor actions, but then you're in the situation of having the car constantly second-guessing the driver's intent. It could be done, but it might be very challenging to do well.
Of course, if you're assuming the kids will all end up with their own self-driving cars from day one, well, who needs to learn to drive at all? Also potentially a rather generous assumption.
It does raise an interesting point though - as autonomous vehicles become commonplace, learning to drive will be a very different thing. We will want to learn to drive in precisely the situations where the car is weakest: hings like off-road driving (even just driving across the field to your picnic site) and getting unstuck from snow/mud/accidents... though actually I could see AI sensors and reaction times being *extremely* advantageous for, for example, rocking a car out of snow or mud, though perhaps with a human judgment overseeing it.