I was able to increase my verbal from 29 to 40.
For me the key was RC.
I was able to determine that SC was not my weakness (but definitely an easy area to make improvements). By looking at multiple sources, I was able to see that I had a good approach and that I was able to get 90% of my SCs correct.
CR is almost mathematical in approach. You have given info, you are asked a specific question relating to the given info, and then you answer using nothing more than the given info.
RC for me was the killer. Once I figured out Rhyme's approach (and focused on the fact that ALL of the answers are staring at you the entire time), I was able to see dramatic improvements in my verbal score.
However, like everyone else has said, you need to determine which area is your particular weakness.
Hope that helps somewhat.