Apparently I came out somewhere in the "proficient" range on my mini-NECAP math, getting 67% right. That tells you something about the difficulty of the test questions when you do well to miss one in three.
I don't know in practice what percentage of questions a student would need to get right to get from a "1" to a "2," but I bet it is pretty low -- which seems easy I guess but it takes a lot of fortitude to stick with a test when you know you're getting more wrong than right. Especially if they don't order the questions from easiest to hardest. Our mock NECAP didn't, but I don't know about the real one.
In practice, graduation for a lot of kids may come down to not blowing your cool a few hours into this thing and making a few savvy guesses instead of putting your head down. That's easier, I'd note, if you weren't exposed to lead as a child.