Thank you very much for your advices.
I know that this kind of question is trite, but reading and comprehending passages is my main headache in GMAT.
I have bought recently some non-GMAT books, which are kind of deep, and also I read Economist magazine sometimes. I will purchase some Shakespeare books as well, since I have never read any book from Shakespeare in English, and I am very much interested to read some literature books.
I believe I have to change rudimentary my reading habit in order to perform well in RC, and as both of you said the only way to improve reading skill is to read.
I did the GMAT twice in this year Jun and July, but I could not score well in Verbal. I want to give a last chance to take GMAT again, but I want to have a solid verbal skill in English when I am giving the exam again.
Thank you