In the process of looking into getting my high school diploma recognized by German unis, I found that the IB and AP diplomas are practically the only international secondary school diplomas considered an Abitur equivalent here. Meaning, I would have been screwed with just an American high school diploma. Thank goodness! I guess TOK with Mr. R was good for something . . .
Speaking of high school...
I'm so ridiculously impressed by how quickly the woman at the university wrote back (45 minutes later) and told me that all my certificates were okay. Yay!