Okay, I think I'll shoot for the intuitive approach. List method is useful for some things but, you're right, for the ones they don't explicit say I cross out as "no opinion." Thanks!
@K there's definitely a difference in difficulty on PTs I've been taking. A more obvious variance in the modern ones too, in my opinion. I find the scale to be kind of unfair usually, so I try to improve my raw score, in general.