How is Eros different than the Battle School?

Ender hates Eros from the moment they land. Everything feels odd, and he is surrounded by strangers. He is isolated as he gets individual tutoring from teachers. Because of this isolation, Ender throws himself into his studies, learning quickly and well. His favorite activity is to play on the simulator, essentially "the most perfect videogame he had ever played." Ender starts in control of just one fighter ship, but he is soon allowed to "command" a four-fighter squadron. The computer starts giving him specific objectives. Ender notices that after he uses a tactic against it, the computer uses it back against him in a matter of minutes, learning like an enemy would. Ender learns to spread his focus over the entire group of ships, as a real commander would.