to produce skilled workers for the job force
to teach children how to analyze and solve problems in all contexts
to teach children everything they need to know up to a certain level about specific academic topics
to prepare students for college
to prepare students to be informed citizens in the world
to create a well-rounded, knowledgeable child who can function well in society
to give every child broad-based knowledge and even footing from which to start a career as adults
I think the two I checked go together--if children are taught how to analyze and solve problems and they're informed about the world and their role in it, then education becomes the tool linking information, critical capacity, and action.