Ingenious Plot Or Unrealistic Exercise?- 5th year of high school?

So, essentially I had what I think to be an utterly genius idea: What if I purposefully fail a required high school course so that I can take a fifth year of high school? I know you're probably wondering "Why in God's name would anybody want to do that?" Well, let me give you a little background about myself and give my reasons and perhaps things will begin making a little sense. I'm a junior in High School, and I would like to consider myself "smart." I take three AP (advanced placement- if I do well, I get college credit), 2 honors classes, and concert choir as of now, and my lowest grade is a 100. I scored a 2190 on my SAT (not incredibly fantastic, but it is within pretty much every college's middle 50). I'm planning on taking 6 AP classes next year, which would bring my AP class total to 9. So here's where the trouble comes in: 9 classes would not eliminate my freshman year in college- The solution: Take another 6 the next year by failing AP Economics during the last semester of my senior year. If the school forces me to take summer school, I could easily fail that as well and they would have to allow me to take classes the next year. I could possibly even get a 5 on the AP Econ exam, even with me failing. With 15 AP classes around my belt, I could most likely jump directly into Sophomore year, or have to take very minimal classes my Freshman one. The school I'm looking into is Cornell University, and quite frankly, I would be very happy not having to pay +$60,000 for my Freshman year. From what I understand, Cornell does not give merit based scholarships, only financial need-based ones. My family makes just enough where we don't get the amount of aid needed, but not enough to actually afford that kind of expense. So to the crux of the issue: Are there any obvious pitfalls that I'm missing? I did the math and my GPA would still end up being a 3.85, and I would think my SAT score would help buffer any academic competence issues that may arise. I sort of see that colleges might not want me to ruin their graduation rate, but I don't know if they'll look at me and suspect that I would do that. Any thoughts are helpful.