Drive through the slalom course.  The cones which are lying on their side point to where you should drive.
\
This lesson will help you learn how to control the car when changing direction from left to right.
\
A standing cone with a lying down cone beside it is commonly used in autocross events to mark out the track.

Once you have entered into the slalom, do not accelerate continuosly otherwise you will be traveling too fast to navigate the course effectively.  Instead try to maintain a slow and even speed by balancing the car lightly on the throttle.