Almost completely mystified

"Irritation--grizzled law school vets, sing the irritation of law school exams,
inane, unpredictable, that cost me untold effort"

I feel like I passed, but beyond that, except for the flush of "I finished, and I had lots to say; sweet! must've gone pretty well" followed by the next day's second- and third-guessing, I quite honestly have no idea how I did. Any thoughts on corrolation between performance and expected performance? Or, as I predict, is it just a crapshoot?

Well, I only have to do it 5 more times.