Personally I found the verbal reasoning section to be very difficult to improve in.
Most everyone will tell you to practice and read good material such as the wall street journal, critical essays, NYtimes and other materials of that type.
The technique that I found to work is reading the passage(to get the general idea and main idea, tone) and then reading the questions and looking back to the passage to find the answer. All the answers are in the passage, you just have to find them (except for the application questions, but there arent' that many of those so just take a shot at it). Don't get caught up on a passage...keep going and also i found it helpful to skim the passages first and mark the passages that you want to do first and leave the hard ones for last (expecting that you'll miss the most in those sections). Get as many right and spend less time one the hard ones b/c there is a good chance you'll miss them. Timing is key!
