How is Ender different from the other boys going to battle school

Ender is only six years old when we first meet him, but he is a brilliant boy who has been monitored to see whether or not he should go to "Battle School" to become an International Fleet commander. Ender is the hope of the Fleet against the alien "buggers." Due to his incredibly quick learning and perfectly developed temperament, Ender rises above the other boys to become fleet commander.