BarBri Confession/Query

I've asked people in my BarBri classes in Cambridge and D.C. and nobody seems to know, so I'll turn to the internet: what percentage of questions are we supposed to be getting correct on these assignments? I assume we should get more introductory problems correct than intermediate problems, but the effect of increasing difficult should be slightly mitigated by our increasing familiarity with the material.

Aside from the finger wagging the first day about getting a scaled score of 140 (raw score of 125-130) on the MBE, I've heard nothing since. Should I be happy to get 80% of a set correct? Deeply concerned to get 60%? HELP.