Your idea about ending school sooner is spot on. My wife has almost 2 decades experience teaching High School English. Your Junior & Senior years are fluff - they're not tracked with standardized testing of any sort in those last two years (at least in Washington State) and you've met all of the content requirements needed to graduate (just not the credit count). That's why running start exists - you're already "done" with your public education content by the time you've hit year 10 - go ahead and get your "credits" at local college/community college and get both the HS diploma and AA degree.