I didn't even write a single thing about the essay prompt when I took the SAT. EVERY SAT essay is graded in 2-4 seconds. All you need is good handwriting, square paragraphs, and underlined fancy words.
I restated the question in the first sentence, and then just wrote about what I did that weekend and threw in some big words in the middle of sentences where they made no sense at all, not even used in the correct context, and underlined them.
I got an 11/12 on the essay and I didn't even address the prompt at all. I learned this in my "how to take the SAT" class.