While I definitely think it is too early to be strategizing about this in any concrete way, I would suggest that you consider high schools that offer the IB diploma. There are many universities that will give one full year of credit for the IB. In many cases, this is done after successful completion of the freshman year. Of course, a student still needs to complete all the requirements for the major, etc., but I know that for some students embarking on a path that will involve many years of graduate school, this was helpful.