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Strange thing happended to me while doing gmatprep [#permalink]
 13 May 2009, 18:32
I never took gmatprep before so I just gave it a try. I solved up to 27th question and I realized that I had 12 minutes... I knew i will get really low score so I just filled any answer without reading questions. I also filled up verbal answers to see how I did in math. Strangely I got 47 in math and only 1 out of 10 questions I guessed was right.... I think i had 3 incorrects before 27... Is this possible? And how can I improve my math score? any books, tests? I have og11,12 og math review, mgmat number property I have kaplan 800 but didnt do it yet.
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Re: Strange thing happended to me while doing gmatprep [#permalink]
16 May 2009, 22:22
Very strange indeed! There has been quite a bit of discussion here: gmat-scoring-algorithm-my-observations-28493.htmlNumber of theories exist. What were the question numbers you missed prior to the last 10? Have you taken GMAT prep before? Are you usually a high Math scorer?
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Re: Strange thing happended to me while doing gmatprep [#permalink]
17 May 2009, 12:05
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Actually, your performance on GMATPrep isn't strange at all, at least acording to my GPrep experience, which is... well, lets just say I took tests 10 - 15 times... Each.   With 3 incorrects in the first 27 questions the test has "put" you in the "51" bracket. Had you continued with such a performance you would have ended with 51 in the end of the math section. But with 12 minutes left you couldn't and, due to random guessing on the left 10 questions, you ended up with Q47. I would say it is a perfectly normal score for such a test pattern. If you repeat that on real test, with only 3 incorrects in the first 27 questions (especially if incorrects are clustered near 20-27 group) I am 100% sure you will end up with 45+ raw score regardless of your performance in the last 10 questions. In addition, MGMAT have conducted some analysis of the Gprep software in which they followed the results depending on the number of incorrect answers in the various segments of the test. They answered randomly on the first ten or the last ten questions with almost 100% performance on the rest of the test. When they blind guessed the last ten questions they encountered the scor drop very similar to yours. Unfortunately, all of this just confirms the old myth that 10 to 15 questions are extremely important on the GMAT and, consequently, greater attention should be given to them.
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Re: Strange thing happended to me while doing gmatprep [#permalink]
17 May 2009, 20:32
bb wrote: Very strange indeed! There has been quite a bit of discussion here: gmat-scoring-algorithm-my-observations-28493.htmlNumber of theories exist. What were the question numbers you missed prior to the last 10? Have you taken GMAT prep before? Are you usually a high Math scorer? I think they were 1 (10s) and 2 (20s). I took gmat 6 months ago and got 44 in math(First try). I only took gmatprep verbal section once.
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Re: Strange thing happended to me while doing gmatprep [#permalink]
17 May 2009, 20:37
thank you Pathfinder_77 wow really good info. I should try that in verbal... 
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Re: Strange thing happended to me while doing gmatprep [#permalink]
18 May 2009, 05:51
mandb wrote: thank you Pathfinder_77 wow really good info. I should try that in verbal...  Oh, Verbal... No my friend, verbal has totally different scoring algorithm. I am not 100% sure how it works, I assume the early questions are more important too, but its' scoring algorithm is fundamentally different than those of math section. For example, you can score Q48 even if you made 15-16 mistakes. Of course, it depends on the distribution of your wrong answers. In Verbal, if you make 15-16 mistakes you will not score more than V34-35 ragardless of the distribution. If you score V48, it means you've made only 2-3 mistakes, or V37 - you've made somwhere arround 13 mistakes. Do you see the pattern? It seems that verbal takes your 51 raw score and than discounts it for (n+1), where "n" is the number of mistakes you made during this section of GMAT. Due to this penalization of every single mistake, it is much harder to score high 40s in Verbal when compared to Quant.
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Re: Strange thing happended to me while doing gmatprep [#permalink]
18 May 2009, 08:48
Pathfinder_77 wrote: It seems that verbal takes your 51 raw score and than discounts it for (n+1), where "n" is the number of mistakes you made during this section of GMAT. Due to this penalization of every single mistake, it is much harder to score high 40s in Verbal when compared to Quant. I've noticed this pattern as well. V45 = approx. 5 incorrect answers, V40 = approx. 10 incorrect answers, etc.
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Re: Strange thing happended to me while doing gmatprep [#permalink]
19 May 2009, 06:31
Avernusaur wrote: Pathfinder_77 wrote: It seems that verbal takes your 51 raw score and than discounts it for (n+1), where "n" is the number of mistakes you made during this section of GMAT. Due to this penalization of every single mistake, it is much harder to score high 40s in Verbal when compared to Quant. I've noticed this pattern as well. V45 = approx. 5 incorrect answers, V40 = approx. 10 incorrect answers, etc. ...and V28 (13 incorrect)!, last week. There's big difference between 10 incorrect & 13 incorrect, however, I think its got to do with errors in SC / CR / RC. I got 7 errors in RC!
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Re: Strange thing happended to me while doing gmatprep [#permalink]
19 May 2009, 08:52
pm4553 wrote: ...and V28 (13 incorrect)!, last week. There's big difference between 10 incorrect & 13 incorrect, however, I think its got to do with errors in SC / CR / RC. I got 7 errors in RC! That's possible. i think we can conclude that Verbal is a way harsher grader than quant. The "discount" equation i gave overthere (n+1) will probably be the case when you don't have many mistakes in the first 10 questions and in situation where wrong answers are not clustered around some specific area (SC, CR or RC). That is the reason I appeal on test takers to use GMATPrep as a practicing tool rather then the estimator of the future performance. many test takers "save" GMATprep tests for the last week in order to try to predict their performance on the real deal. Frankly, I don't see the point of that. What's the point of realizing 3 days before the test that you are going to score 680 on the GMAT? What can you do in 3 days to alter your faith? Well, this is just my oppinion and my advice. In the end of the day, everyone should use Gprep (and every other tool) in the way which is most convenient for him/her. I just like to hear others experiences in testing the GMATprep. It seems that observation based on trial and error is our only weapon.
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Re: Strange thing happended to me while doing gmatprep
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19 May 2009, 08:52
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