The GRE is a Computer Adaptive Test consisting of 3 multiple-choice sections--Quantitative, Analytical Writing, and Verbal. It also includes an essay section - Writing Assessment (mandatory only for certain universities). Students need to write this section on a separate day. The Computer Adaptive Test, as the name suggests, picks the questions based on the test taker's response to the given question. The first question is always of medium difficulty level and from then on the score graph starts to move upward or downward as per the performance of the candidate. A test-taker of higher caliber will get tougher questions than a test-taker of a lower caliber. As the test progresses, the score graph begin to narrow down to a range and that range will determine the final score.
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First of all, great that you have the will to want to pass the GRE. You can get GRE test prep courses in Barron's online GRE Prep Courses. Here is the link, http://barronstestprep.com/GRE/?gclid=CP2Aiqua264CFQ8b6wodLDpWXA
A good way to prepare for the GRE test is to purchase a prep book. In this website, you'll find the top prep books for the GRE: http://gradschool.about.com/od/gre/tp/topgrebooks.htm
You can take up the Mock test for GRE online but there is no way possible to take up the test online. You can do so in the test center but not from the location of your convince.
The GRE Prep test usually helps the students and gives an idea of how the test is going to measured and what kind of strategies will be used etc. It gives you an idea of what to expect when you sit for the exam.
GRE iers Graduate Record Examination, there are various sites that offer the mock GRE practise test papers. I when I was preparing for my GRE I browesed many such sites and found this one www.examville.com the best. All the best