Well in my preparations I've essentially tried out as many practice exams to try and settle on where I actually am and where I need to go. I've found that on tests I hear are fairly representative I get around ~60%. Not great, but this is only my second week of studies so not terrible. Studying is an exercise in progressive elaboration so I expected that it wasn't great but it'd get better and I wasn't too far off the mark.
Then I took that test last night and got a whopping 38%. I went from thinking "Not bad, I can do this" to "OMG, why am I even trying?". She really does a good job of tripping you up with a word (like this one word changes the whole question). I've got a long way to go.