I did something similar to this in high school a few years ago. I ended up losing to another team in the class that bought Gamestop and other related stocks. I stuck with stocks like Intel and GE. If the game had ended even a two weeks later, I would have won.

These games teach high school students very little about investing, especially long term. The other team's strategy was simply "I play video games and I like Gamestop, so let's buy Gamestop!".