You have to wait for the night, turn off all lights in and on the car and drive 20 km at atleast 100 km/h or 30 km at atleast 60 km/h.
If you completed the required kilometers, you have mastered the challenge. Now, you gotta upload a video of it on Tiktok.
The Dean Maggie Challenge is to take seven shots in three minutes. It was a challenge unintentionally instituted by a dean of Harvey Mudd College when she used it as an example of irresponsible alcohol use in a conference with students.