You have to reliably convince a grader in the 1-2 min they spend on it that your essay is in the top 1% or so (that's the fraction of perfect 12s), and the grader intuitively knows the score she'll give you within one point after 30 seconds or less. I doubt there is a sure way to do it without hitting their mental model of a perfect essay on all counts.
You need to reliably convince a grader that they should
Few restrictions on how, like with AIbox. (You could tell them you're an AI, or an alien, or whatnot, as long as it's believable.)
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