Any ability depends on repetition. The greater the practice, the greater the skill. This includes driving, and a lack of practice may have dimmed you capacities. Or you simply may have learned enough to pass your examination for a driving license, but you feel that you need more classes so as to be able to take to the road with a greater sense of safety.
Driving schools exist to meet any of these needs, and offer classes on different levels: from the driver who got his license at the minimum age, hasn’t driven for years and now wants to get back behind the wheel, to the expert driver who wants to be safer by learning some advanced manoeuvres for dangerous situations.
And there is something else: the new cars have equipment and technology that many drivers are not familiar with. Some of the courses in the driving schools present these systems and explain how to get the most out of them.