My feeling is that, based on more than a clue and observation, that GMAC in somehow mimics ETS and the GRE exam. Not so much in the contents (which have some sort of overlap, though: RC and CR) but in the categorization.
What that means: look at the menu in the OG Verbal review 2020
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Now at the new book
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They never until now called the verbal and quant section: Verbal reasoning (which is so indeed) and Quantitative reasoning as ETS calls them into GRE OGs.
maybe all this is just my assumption. However, I am pretty confident something is going this way

Moreover, I did not go through the guide in its entirety but the first CR which is a bold face we do have already
https://gmatclub.com/forum/most-of-west ... 21820.htmlWhich has the tag sub-600 level
Regards