If your homeschooled and do all of your work for the year early and you move up to the next grade and do next years work, all the way to 12th grade work, could you graduate early? I know, it sounds confusing ._.
I'm online homeschooled and the way my school works is they put out that you're able to work at your own pace but in reality they only let you do one semester's worth of work at a time. You can't continue to the next grade levels work before anyone else as well. Every school is different though! Hope this helps.
I'm pretty sure all high schools depend on the amount of credits you have, so if you have enough then I see now problem with it