At the start of 11th grade, my parents got the idea that I might be happier at a local college than in high school. They asked the principal if he would write a recommendation letter for me. He wrote that he did not believe I could adequately perform at the college level.
My parents disregarded this, and I got enrolled in classes. Once I was there, I was enjoying school much more than I was at the high school, and I often did better than the regular college students...
I would like to think that this sort of promotion out of drudgery would be common-place by now, but I have no idea.
From what I understand, many school districts in the USA have rules against this. Or, they have no advertised route for early completion, which is effectively the same thing.
When I was in high school, I only managed to skip one math class. I was forbidden from taking AP physics without first taking non-AP physics, and the school was unwilling to work with me so that I could take classes at a local college (i.e. I wouldn't graduate because they wouldn't help me make the schedule work).
My parents disregarded this, and I got enrolled in classes. Once I was there, I was enjoying school much more than I was at the high school, and I often did better than the regular college students...
I would like to think that this sort of promotion out of drudgery would be common-place by now, but I have no idea.