Taking the GMATPrep Practice Tests Multiple Times
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I think this is a very good article and addresses concerns of many students who are preparing for GMAT. GMAC just hands over 2 practise tests and lots of people are very sceptical about wasting one test without any preparation.
On a personal experience, I however believe that it is extremely important to gauge the existing status. This will allow the individuals to exactly understand where extra work is needed. As mentioned in the article, there is a large database of questions from which the test questions are drawn. So there is a very good chance that there would not be lots of repetitions.
The GMAT prep software also relies on the time taken to answer a question to judge the next question. So in order to reduce duplications, it would be a good idea to actually take more time for questions, answers to which are already known. Also it is possible to clear the memory of earlier tests taken. The method to do so is mentioned here. Unfortunately, this software only runs in Windows.