The best school I ever attended divided classes between academic (attended at one's grade level) and social (attended at one's age level) --- some teachers were accredited as faculty at a nearby college, and once one had finished a subject through 12th grade, one could begin taking college courses --- many students were awarded 4-year college degrees along with their high school diploma when graduating.
The Mississippi State Supreme Court ruled it illegal since it conferred an advantage on students who were able to work and study well enough to move ahead, but failed to make arrangements for students who couldn't to get free college after graduating from high school.
replies(2):