It is probably a lot easier going from regular school for elementary and middle school to home school for high school, than it is to go from home school in elementary and middle school to regular school for high school. I have heard of alternative forms of school (at least for high school) that involve a classroom of peers but which are carried out in a different way than regular or home school educations often are. These alternative schools allow the students to do pretty much whatever they want, but they make resources available to them. For example, they staff mathematicians, sociologists, historians, etc. Additionally they have a large selection of literature and such made available. The children are allowed to work on whatever they want to, and they can ask for assistance from the staff when required. I don't know the extent of freedom provided by such schools, but from what I can gather the students are essentially free to do as they please and work on learning whatever they find interesting. The end result is that the students are largely self taught and self directed, but that they have professional assistance available to them if they ever get stuck on anything or need direction provided.