Practice reading for the main idea of a passage.
Work on taking notes while you are reading.
Rehearse looking for words in the passages that point to its structure and meaning, words and phrases such as "however," "but" and "in addition."
Answer the questions quickly after reading the passage. It may even be beneficial to read the questions first.
Practice using the process of elimination.
Take several practice tests found online or in specialized study books to get a feel for the verbal section of the GMAT.
Consider reading a specialized GMAT study book, taking a GMAT prep course or receiving GMAT preparation tutoring.