[@darkwolf687]
Ender's Game:
Far future.

An alien race, an ant-like hivemind known as the Formics, or informally as 'the buggars,' invaded Earth and levelled the Chinese superpower- shortly afterwards, the world managed to fight them off. 

After the war, it was decided they needed commanders to lead their spaceships against the Formics- they started building fleets and sending them out to known Formic planets. 

Ender's Game focuses on Ender, who went up to the orbital space station around Earth, called The Battle School, to train with other extraordinary children to become future commanders, using their great neural elasticity. Child geniuses in space training in squad tactics to be applied to spaceships, essentially.

In the book and movie, the chilluns there were really just focused on winning the game of the battleroom.

I'd suggest watching the movie, but if you don't have time, no biggie. I can write up all the lore and stuff that's required.