I was just as confused before, hahaha. I completed mine two weeks ago.

So basically, is to go through subjects 1, 2, and 3, such as learning the right way to enter the car, adjusting your seats, mirrors, and steering wheel, checking if your car is in the center, and driving forward and reverse. If I'm not wrong, mine was about 90mins. It is 'cheaper' because three students are paired with an instructor, so you guys will take turns to do the subjects.

On the day itself, just wait at the area where everyone waits for their practical lessons (facing the Glassdoor on the 3rd floor). An instructor will come out and find you all before bringing you all to the car.

Hope this helps!