If you're really determined to do what it takes to improve your verbal score, there's only one effective way to do it: read books. Specifically, read *good* books. Pick some college-level works of fiction or nonfiction (whichever you prefer) and just try to read as much as you can, in whatever spare time you have.
In my experience, the MCAT prep courses really can't teach you how to do well on the Verbal section. Verbal Reasoning is just something you have to work on by yourself, and is not something that can be easily learned from an MCAT prep course in a few hours! Remember that the main (unwritten) reason for the existence of the Verbal section in the first place is to weed out foreign students who have stellar science GPAs but can't speak or understand English! Thus, it's just an additional hurdle you've got to overcome.
Good luck!