Hi Shaq.
The truth about GMAT verbal is that scoring high takes skills more than it does knowledge. So much of what you have to do in order to increase your score involves developing certain skills, and doing that does not really happen via reading a book about GMAT verbal.
To get right answers to GMAT verbal questions you need, basically, two things, vision and skill in using logic to make decisions. You need vision to see the key details that make the right answers right, and the wrong answers wrong. You need to use logic to see which sentences make sense, which CR answer choices really answer the questions asked and which RC answer choices truly reflect what is said in the passages.
So, as part of what you do to increase your verbal score, slow down, and rather than reading more material to score higher, seek to become good at seeing what's going on and using logic to work your way to answers. You will be better off struggling with questions for an hour each and really learning to get right answers than going through question after question, getting them wrong and reading explanations, without making any significant progress in developing vision and skill in using logic to make decisions.
