It also depends on the type of learner the kid is, and the style of teaching in the courses. A kid who is a visual learner, with poor listening skills will do very poorly in an on- line course that includes taped lectures. They just won’t be able to pay attention.
Those kids might do better with a type of course that is just reading and comprehending , answering questions following each day’s assignment.
You have to know the learning style of the student and make sure the course is a good fit.
I think that the state of Missouri and/or the University of Missouri had online high school courses. They still may but the few educational programs that Jay Nixon cut all seem to diminish the power of the teachers unions or reduce the physical presence of students in the government schools.