home-schooled

from The Collaborative International Dictionary of English v.0.48

home-schooled \home-schooled\ a.
   Receiving or having received formal education, especially
   primary or secondary education, at home rather than in a
   school. The instruction at home may be accomplished by
   parents or by professionals who come to the home; as,
   home-schooled students often get higher test scores than
   those educated in schools.
   [PJC]