Accelerate as fast as possible, get on the brakes after the tunnel, and stop in the small area between the hay bales and the cones.
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You will learn the skill of braking from very high speeds.
You need to stop accurately in the small target area.
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You should start braking at some point between the lines of hay bales on either side of the track.

When you decide to brake, apply the brakes strongly but progressively.  If any wheels lock up because of excessive braking, try to ease off the brakes slightly to allow the wheels to regain their grip and then re-apply the brakes.