The driving school in Doherty is a course rather than a mission: twelve exercises in car control, each scored bronze, silver or gold, and each teaching something the rest of San Andreas will ask for. The 360, the handbrake stop and the two-wheel work all turn up in missions later.
It is optional and it pays in vehicles rather than money. A bronze average puts a Super GT on the forecourt, silver a Bullet, gold a Hotknife — and passing it is what lets the Wang Cars showroom open once Yay Ka-Boom-Boom is done.