you have to keep practicing until you build a strong fluency in both math and verbal. Rather than spending about 4-5 minutes in each verbal question, you have to improve your speed to the point that you can read faster with good comprehension and then select the right answer in just less than 2 minutes per question.
It's like an athlete who practices for a 100 meters track race. If you want to break the time, you simply have to keep practicing over and over again until you build the speed. Read as many articles from the economists, articles that are so ridiculously boring to you. Such boring articles will train your mind read faster with better understanding. Unlike improving in math, improving in verbal is not a 1 night job.
How good is your grammar? if it's not that good, I recommend you to go to http://www.gmaxonline.com
This website will help you with your foundation that you need to have for the verbal. After that, you need to keep practicing until you get to the level that you want to achieve.
Hope i've helped!