If you like Ender's Game by Orson Scott Card
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Andrew "Ender" Wiggins is the result of a desperate breeding experiment, combined with years of harsh & unforgiving training. Ender thinks he is only playing computer simulated wargames--in fact, he is commanding the last great fleet of Earth.
If you liked Ender's Game by Orson Scott Card, you may enjoy these other titles:
Archangel by Sharon Shinn
A dash of science fiction, a handful of fantasy, and a sprinkling of suspense enliven the story of the Archangel Gabriel and his reluctant wife Rachel.
The City of Ember (and series) by Jeanne DuPrau
In a post-apocalypse city on the verge of collapse, 12-year-olds Lina and Doon join forces to flee to an unknown world above ground.
D.A. by Connie Willis
Theodora Baumgarten has just been selected as an IASA space cadet, and therein lies the problem. She didn't apply for the ultra-coveted posting, and doesn't relish spending years aboard the ship to which she's been assigned. But the plucky young heroine, in true Heinlein fashion, has no plans to go along with the program. Aided by her hacker best friend Kimkim, in a screwball comedy that has become Connie Wills' hallmark, Theodora will stop at nothing to uncover the conspiracy that has her shanghaied.
The Ear, the Eye, and the Arm by Nancy Farmer
Humor and science fiction combine in this richly imagined story set in 2194 in Zimbabwe. Three mutant detectives use their special powers to search for General Matsika's three children who are kidnapped and put to work in a plastic mine.
Feed by M. T. Anderson
In a future where most people have computer implants in their heads to control their environment, a boy meets an unusual girl who is in serious trouble.
Grease Monkey by Tim Eldred
Cadet Robin Plotnik is assigned to work under Mac Gimbensky, feisty ace mechanic for a crack squadron of pilots preparing for the return of extraterrestrials whose first attack eliminated 60 percent of human life. Mac is a gorilla, one of millions that were accelerated with rapid evolution in order to replenish Earth's defensive numbers, should the attackers return." (review from School Library Journal Review)
The Hunger Games by Suzanne Collins
In a future North America, where the rulers of Panem maintain control through an annual televised survival competition pitting young people from each of the twelve districts against one another, sixteen-year-old Katniss's skills are put to the test when she voluntarily takes her younger sister's place.
Old Man's War by John Scalzi
John Perry did two things on his 75th birthday. First he visited his wife's grave. Then he joined the army. The good news is that humanity finally made it into interstellar space. The bad news is that planets fit to live on are scarce - and aliens willing to fight for them are common. The universe, it turns out, is a hostile place. So: we fight. To defend Earth (a target for our new enemies, should we let them get close enough) and to stake our own claim to planetary real estate. Far from Earth, the war has gone on for decades: brutal, bloody, unyielding.Earth itself is a backwater. The bulk of humanity's resources are in the hands of the Colonial Defense Force, which shields the home planet from too much knowledge of the situation. What's known to everybody is that when you reach retirement age, you can join the CDF. They don't want young people; they want people who carry the knowledge and skills of decades of living. You'll be taken off Earth and never allowed to return. You'll serve your time at the front. And if you survive, you'll be given a generous homestead stake of your own, on one of our hard-won colony planets. John Perry is taking that deal. He has only the vaguest idea what to expect. Because the actual fight, light-years from home, is far, far harder than he can imagine - and what he will become is far stranger.
Only You Can Save Mankind by Terry Pratchett
Twelve-year-old Johnny endures tensions between his parents, watches television coverage of the Gulf War, and plays a computer game called Only You Can Save Mankind, in which he is increasingly drawn into the reality of the alien ScreeWee.
Space Wars: The First Six Hours of World War III by Bill Scott
The U.S. Strategic Command has gathered top military commanders, space-company executives, and U.S. intelligence experts to play a game exploring how the loss of critical satellites could lead to nuclear war. What the players don’t know is that this isn’t a game - the war has already begun.
Uglies (and series) by Scott Westerfeld
Everybody gets to be supermodel gorgeous. What could be wrong with that? Tally is about to turn sixteen, and she can't wait. Not for her license - for turning pretty.