In all the other review books in the series--Chemistry, Physics, Bio and Orgo--in the introduction (towards the end) it says that the 30 minute sample exams have (and I'm paraphrasing here) 'all the easy questions removed. We feel that you can handle those without too much help from us.' If you have any of the other books, look it up. When I checked out the Verbal reasoning book though, no introduction! Go figure. Anyway, I presume that they use the same format for the Verbal book's 30 minute lecture exams--easy questions removed, focus on harder stuff.
I know what you mean, I havent gotten to Verbal review yet, I just finished the Physics book and I noticed that I was scoring 11's and 12's on the 30 minute practice tests and sometimes not even completing the test in time (and I like to think I'm pretty good at Physics). I figured I must need a lot more practice till I read the intro--I guess its there for a reason!
Anyway, if you have the other books and havent gotten to the sciences yet, you're in for some bruising practice tests! I went over the 1001 questions series for Physics and it seems comparatively tame. If you did buy their set and got the free full-length practice MCAT book, have you taken it yet? Is it easy/hard/avg?