Motivation.
none. you can earn your GED in the military! :]
No, you need to be in the military, or hired the the army of the particular army base you are mentioning to.
depends on what job u want to do in the military, a foot soldier doesn't need to be a math genius but a military engineer might
You need to train in the military.
No
You need to ba 18 but you can join the ROTC or a military group for younger people but it is not technically the "Military"
To serve in the military you need to be 18 years old.
Of course you need to have good grades... as much as possible don't have grades below 85% . That's the standard grade you need to have to be able to get into the military. :)
You don't need one
You need to be more specific.
Madagascar has no military "requirements" . -They have no enemies and no country is threatening them. They do not need an army.