It is the wrong lesson, but to prove that to the students, you have to rejig the experiment where their picks are compared to those of a primate picking stocks at random.
The point is that for the purposes of the lesson the time horizon is too short to know if a student got lucky or made a good decision based on research and the like.
Anecdotally I won one of these leagues in school by picking penny stocks and moving in and out of them a lot. Not the lesson in long term investing the teacher wanted to convey…
Stanley Druckenmiller: my risk management strategy is to put all of my eggs into one basket and watch it very closely.