Yes it was 8, not 18. Pretty ridiculous.
For Verbal it can certainly help, but there are also things you can do to help yourself in the meantime.
I suggest reading Kurt Vonneguts books if your verbal is below 6. Above 6 start reading the Economist. At a 6 do a little bit of both.
Depending on what package you go with you get different things. At the premier level you will certainly get the intangibles of how to approach the test. I usually don't even go over all that much content.
For example, if I were to ask (regardless of section)
.... all of the following are true EXCEPT
Where is the answer going to be?
Statistically speaking, the answer is more likely to be C or D rather than A or B. As a writer of questions (I do write for TPR), you want a test taker to look at at A or B and pick it because it is true. Very common trap.
It is amazing how much psychology of test taking matters.