International to American Ivy League Chances

Please tell a consistent story:

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I moved to America when I was in the middle of my senior year in Korea. The schools here are telling me that I have to attend 11th grade this fall due to lack of credits for graduation (which will mean that I will graduate two years later than my friends, who have graduated this spring) or take the GED since I am 18. Should I go for a two-year-late high school diploma or take the GED to go to a community college and transfer in two years? And if I take the GED, can I apply to universities as an undergraduate this fall despite being enrolled in a community college?
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and a few weeks ago you wrote:


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Now I'm moving back to America and will attend 12th grade there. Do you think I have a chance to be accepted to an Ivy League if I write a good essay? (By the way, how am I supposed to put all my extracurricular activities into my essay?) <<<<

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