by StaceyKoprince Wed Jun 26, 2013 12:18 pm
Okay, I talked to our guy in charge of this and found out the story!
We published new explanations for quant OG13 earlier this year and, at that time, we also updated how we were labeling these. So, go with the new book ratings: easy, medium, hard, devilish. Those are more accurate than the older "number" rankings - which were just based on our own best guess. (We based the new ratings on a bunch of data we collected from actual students doing the problems!)
OG Archer still needs to be updated; someone's working on it, but it'll be a little while. So just go by the book. :)
Stacey Koprince
Instructor
Director, Content & Curriculum
ManhattanPrep