Many of those who taking GMAT worry less about pass of this part of the test, than about numerical section. But it is not necessary to underestimate GMAT Verbal section: many have complexities with this part, and you need to be prepared well for it, especially if English is not native language for you. In GMAT Verbal section to you  will meet such types of questions:

* Correction of errors. These questions test your knowledge of written English. You will see a sentense (often it will be difficult and long), and either the part of a sentense, or all sentense will be underlined. Then you will see variants of answers which consist of various versions of the same sentense. You should choose grammatically correct version of the underlined part of a question. Often those who pass the test "hear", whether the correct sentense is  - practice of oral speech and reading helps very much. You will have about 15 questions of such type.
    * Reading. These are classical questions - you need to read a text in length of 200-300 words and to answer three or four questions on it. Such fragments usually are four. Fragments are usually written by difficult language and are taken from magazines on business and social sciences. It is not necessary to remember all the fragment. Quickly look it through before to look at questions, to feel a theme, then already read questions and come back to the fragment to find the necessary information.
    * The Critical estimation. You will need to answer approximately such 13 questions. You will see the short text in which a writer something confirms or states a certain point of view and tries to give reason for it. Then  you will be asked a question under the text, and you should choose the answer which strengthens or weakens arguments of the author. You also may be asked to find the assumption from which the author makes a start. Here you need to define a conclusion of the author, what arguments he uses for this conclusion, and how he bases the conclusion on the  assumptions. Think of it before to look at variants of answers - they often have a play of words to confuse you.