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uired over a long period of time and that are not related to any specific field of study. In the United States, Canada, and many other countries, the GRE General Test is offered as a computer-based exam administered by select qualified testing centers; however, paper-based exams are offered in areas of the world where computer-based testing is not available. In the graduate school admissions process, the level of emphasis that is placed upon GRE scores varies widely between schools and between departments within schools. The importance of a GRE score can range from being a mere admission formality to an important selection factor. Critics of the GRE have argued that the exam format is so rigid that it effectively tests only how well a student can conform to a standardized test taking procedure.IETS responded by announcing plans in 2006 to radically redesign the test structure starting in the fall of 2007; however, the company has since announced, "Plans for launching an entirely new test all at once were dropped, and ETS decided to introduce new question types and improvements gradually over time." The new questions have been gradually introduced since November 2007. In the United States and Canada, the cost of the general test is US$160 as of March 2010, although ETS will reduce the fee under certain circumstances. They are promoting financial aid to those GRE applicants who prove economic hardship. ETS erases all test records that are older than 5 years, although graduate program policies on the admittance of scores older than 5 years will vary. The first section is a writing section, while the other three are multiple-choice style. One of the multiple choice style exams will test verbal skills, another will test quantitative skills and a third exam will be an experimental section that is not included in the reported score. Test takers do not know which of the three multiple-choice sections is the experimental section. The entire test procedure takes about 4 hours. Verbal section
The verbal section consists of analogies, completions, and reading comprehension passages. Multiple-choice response sections are graded on a scale of 200-800, in 10-point increments. This section primarily tests vocabulary, and average scores in this section are substantially lower than those in the quantitative section. In a typical examination, this section may consist of 30 questions, and 30 minutes may be allotted for it. Quantitative section
The quantitative section, the other multiple-choice section, consists of problem solving and quantitative comparison questions that test high-school level mathematics. In a typical examination, this section may consist of 28 questions, and test takers may be given 45 minutes to complete the section. This section typically includes 14 quantitative comparison questions, 10 discrete quantitative questions (multiple-choice) and 4 data interpretation questions. Analytical writing section
The analytical writing section consists of two different essays, an "issue task" and an "argument task". The writing section is graded on a scale of 0-6, in half-point increments. The essays are written on a computer using a word processing program specifically designed by ETS. The program allows only basic computer functions and does not contain a spell-checker or other advanced features. Each essay is scored by at least two readers on a six-point holistic scale. If the two scores are within one point, the average of the scores is taken. If the two scores differ by more than a point, a third reader examines the response. Issue task
The test taker will be able to choose between two topics upon which to write an essay. The time allowed for this essay is 45 minutes.[11] Issue topics are selected from a pool of questions. Argument task
The test taker will be given an "argument" and will be asked to write an essay that critiques the argument. Test takers are asked to consider the argument's logic and to make suggestions about how to improve the logic of the argument. The time allotted for this essay is 30 minutes. Arguments are selected from a pool of topics. Experimental section
The experimental section, which can be either a verbal, quantitative, or analytical writing task, contains new questions that ETS is considering for future use. Although the experimental section does not count toward the test-taker's score, it is unidentified and appears identical to the real (scored) part of the test. As test takers have no clear way of knowing which section is experimental, they are forced to complete this section. This section does not appear on all GRE examinations. Scoring

Computerized adaptive testing
The common (Verbal and Quantitative) multiple-choice portions of the exam currently use computer-adaptive testing (CAT) methods that automatically change the difficulty of questions as the test taker proceeds with the exam, depending on the number of correct or incorrect answers that are given. The test taker is not allowed to go back and change the answers to previous questions, and some type of answer must be given before the next question is presented. The first question that is given in a multiple-choice section is considered to be an "average level" question that half of the GRE test takers will answer correctly. If the question is answered correctly, then subsequent questions become more difficult. If the question is answered incorrectly, then subsequent questions become easier, until a question is answered correctly. This approach to administration yields scores that are of similar accuracy while using approximately half as many items. However, this effect is moderated with the GRE because it has a fixed length; true CATs are variable length, where the test will stop itself once it has zeroed in on a candidate's ability level. The actual scoring of the test is done with item response theory (IRT). While CAT is associated with IRT, IRT is actually used to score non-CAT exams. The GRE subject tests, which are administered in the traditional paper-and-pencil format, use the same IRT scoring algorithm. The difference that CAT provides is that items are dynamically selected so that the test taker only sees items of appropriate difficulty. Besides the psychometric benefits, this has the added benefit of not wasting the examinee's time by administering items that are far too hard or easy, which occurs in fixed-form testing. An examinee can miss one or more questions on a multiple-choice section and still receive a perfect score of 800. Likewise, even if no question is answered correctly, 200 is the lowest possible. GRE Subject Tests
In addition to the General Test, there are also eight GRE Subject Tests testing knowledge in the specific areas of Biochemistry, Cell and Molecular Biology; Biology; GRE Chemistry;Computer Science; Literature in English; Mathematics; Physics; and Psychology. The length of the exams are 170 minutes. In the past, subject tests were also offered in the areas of Economics, Revised Education, Engineering, Geology, History, Music, Political Science, and Sociology. In April 1998, the Revised Education and Political Science exams were discontinued. In April 2000, the History and Sociology exams were discontinued, and the other four were discontinued in April 2001

Preparation
A variety of resources are available for those wishing to prepare for the GRE. Upon registration, ETS provides preparation software called PowerPrep, which contains two practice tests of retired questions, as well as further practice questions and review material. Since the software replicates both the test format and the questions used, it can be useful to predict the actual GRE scores. ETS does not license their past questions to any other company, making them the only source for official retired material. ETS used to publish the "BIG BOOK" which contained a number of actual GRE questions; however, this publishing was abandoned. Several companies provide courses, books, and other unofficial preparation materials. ETS has claimed that content of the GRE is un-coachable[where?]; however, test preparation companies such as Kaplan and Princeton Review claim that the test format is so rigid that familiarizing oneself with the test's organization, timing, specific foci, and the use of process of elimination is the best way to increase a GRE score. Testing locations
While the general and subject tests are held at many undergraduate institutions, the computer-based general test is only held at test centers with appropriate technological accommodations. Students in major cities in the United States, or those attending large U.S. universities, will usually find a nearby test center, while those in more isolated areas may have to travel a few hours to an urban or university location. Many industrialized countries also have test centers, but at times test-takers must cross country borders. Validity
An analysis of the GRE's validity in predicting graduate school success found a correlation of .30 to .45 between the GRE and both first year and overall graduate GPA. The correlation between GRE score and graduate school completion rates ranged from .11 (for the now defunct analytical section) to .39 (for the GRE subject test). Correlations with faculty ratings ranged from .35 to .50.