Schweser Practice Exam Book Vol. 1

A couple questions: 1. Are the point grading systems they put in the answer key similar to the way CFAI grades essays? Is this confirmed? 2. I noted that they have 70% as a certain passing score and 65% as likely or probable or whatever, right in the exam scoring key. They didn’t have these in either LI or LII books in the past (and they don’t have it in the LI books this year). Where do they get the level of confidence for LIII that what they say is accurate?