Standardized tests have evolved considerably since the traditional paper-and-pencil versions of yore. The Educational Testing Service (ETS) is the governing body behind the GRE, and they determine your final test score. Over the years, the ETS has devoted a tremendous amount of time and research into developing a schmancy computer algorithm to calculate test scores with the highest degree of accuracy. Test-takers no longer complete a static list of questions of varying difficulty. The questions on the computerized test actually change based upon your previous response; each question is customized to reflect your unique knowledge and capabilities.
The automated process of determining GRE test scores is called Computer Adaptive Testing, or CAT. At the beginning of a multiple choice section, CAT assumes that you are an average test-taker with an average score of about 620 for math and 460 for verbal. (Let’s assume you’re working on the verbal section). CAT starts the test by giving you a question that roughly 50% of test takers answer correctly. If you answer the first one incorrectly, CAT will assume that your final score will fall between 200 and 460. It will then ask a new question that, say, 75% of test takers answered correctly. If you get that one wrong, CAT will ask a new question that 90% of test takers answered correctly. And so on. Read the rest of this entry »