What area of verbal do you have the most issue with?
I have heard it said around this forum that Manhattan GMAT has a great SC guide, which you might want to look into. SC is probably the easiest verbal section to improve since it has pretty clearly defined "rules" like quant, so it's easier to beat than CR or RC, which are often just based on opinion/the way you think rather than something that it's easy to "learn."
When you go through a practice test or a verbal review, analyze both the questions you got wrong and the questions you guessed on. Why did you get them wrong? What was the correct answer? Why is that answer better than your answer? If you got a similar problem in the future, could you answer it correctly?
Good luck!
