I didn't really have a formalized verbal strategy but I recommend that you take the point of above literally and read. When I took my first prep test I think scored a 35 in verbal, but throughout my 2 month study period I became enthralled in a series of very long novels. Literally by doing something fun, I inadvertently boosted my score to a 42. This strategy might work even better if you are not a native speaker since the experience will build your vocab.
One thing to note, I was and still am terrible at s/c. My test CATs would show that I'd get 1 out of 4 correct, which equates to near random guessing. I realized this was a weakness that I could not overcome so instead of going crazy I said F it. I spent probably 20 secs on each s/c question, especially when they got hard, and focused on the CR and RC that I knew I could answer confidently.
Although I didnt do as strong as I had hoped in quant (48), another against the grain strategy I used that seemed to work was to pretty much ignore the clock (within reason). I was confident that I could solve most GMAT problems if I had unlimited time but of course I didnt. This is a dangerous game, but I ended up spending a ton of time on the front end questions, which forced me to guess on the last 10 (seriously). Again, I am no gmat expert but somehow if you get can an 80% in math without answering the last 10 questions there is something either weighted heavily on the front end or I just got lucky, but this strategy seemed to work on the test CATs.
Use the test CATs to figure out what kind of test taking approach works for you.
Good luck