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# (Un) Scientific analysis of gmatprep

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Manager
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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30 Jan 2010, 05:24
now it'd easier to contact Princeton (or who it may be) to probe the binary\statistical algorithm its based on... but must admit the dedication and energy on this thread... I could think some of they guys could become great security experts and the other bit more edgy evil minded could become hackers...

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Re: (Un) Scientific analysis of gmatprep [#permalink]

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13 Feb 2010, 01:58
This was great analysis and effort devoted is highly appreciated.

What I believe is they have hired smart people as we pay a lot to give gmat lol.
So, they must have used complex algorithms or artificial intelligence programs to understand and mould the level of question anytime.

Eg. They will throw question randomly from level 550-650 first and based on first few question..say 4-5 or 7-8 they will guess the level. Though after every wrong/right ans level would have been varied.

Now algo had decided we are 650 level, now if we ans question above 650 level we will get actual + bonus mark( these marks are not actual marks, they might be anything used for analysis by the algo) and if we ans the question wrongly below 650 we lose actual + penalty mark. And side by side our initial level is also varied and they keep on throwing questions above/below depending upon our ans.
And these bonus/penalty marks must have been different for different level and number of question answered right/wrong in a row. So just by getting 4-5 right and then guessing a question will not harm.

Now its obvious number of question with difficulty level in their DB must be like this
750+ < 700+ < 650+ < 600+ < 550 +
So more the number of questions in a particular level we exhaust, more likely to have that level in the analysis.

I would like to request BSD to experiment this::: in quant we have 37 questions.. after every 4 right, ans one wrong and in total you will have around 9 wrong.
again after every 8 right, ans 2 wrong in a row and again you will have 9 wrong.
again after 2 right one wrong, 6 right one wrong and again you will have total 9 wrong.
Just compare the results.

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Re: (Un) Scientific analysis of gmatprep [#permalink]

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07 May 2010, 15:20
BUMP!!
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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13 May 2010, 06:35
Getting 12 wrong answers is not the same as getting 12 consecutive wrong answers. Your claim is valid only if you miss 10 consecutive ones in the middle/end and see totally different results compared to missing 10 in the beginning.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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13 May 2010, 08:08
I'm not surprised by your Verbal experiment's outcome. You are essentially saying that one of SC or CR is more important than the other. However, that can't be the case, because an easy SC question should have the same weight as an easy CR question. Likewise, a hard SC question should have the same weight as an equally hard CR question. So when you get all SC correct and the rest wrong, you're essentially getting relatively the same amount of hard questions right as when you get all CR correct and the rest wrong.

Hope the above makes sense.

bsd_lover wrote:
Yup, I was at it again today. Next set of experiments :
3. What is the importance of the last 17 questions?
Experiment : If I get the 1st 20 correct and mess up the last 17 what will happen ?
Methodology : Kick butt in the 1st 20 and guess the last 17
Results : Q49 with 12 wrong overall.
Analysis: Whoa !!! 49 ? with the same number wrong as the 1st experiment ... By Question 20 I had received all the tough quant concept questions that I could have ever hoped for. However, I wasn't expecting a score as high as 49. Although that might be because I got a few guesses on the last 17 right. Even so I'm sure I'd have received 46 or above here. Goes to underscore the importance of those first 10 questions compared to the last few.

4. What is the importance of CR in Verbal ?
Experiment : If I get all the CRs correct and mess up everything else what will happen ?
Methodology : Kick butt in all the CRs and guess everything else
Results : V13 with 29 wrong overall.
Analysis: I think I've busted my own myth that CR is more important than SC in some way. This doesn't seem to be the case. I got 11/11 CRs correct and still could not achieve more than 13. The CRs were different to the ones I usually get (at 40+ level). I encountered 4 of these CRs in the 1st 10 questions.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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13 May 2010, 08:25
excellent work!! keep on posting updates

In verbal we have sc, rc and cr.
However, in math we have different topics.
But what if you get wrong a geometry question, sometimes, I think that later appears another geometry question.
What do you think?
Don't you think that sometimes there are some basic topics that are always cover and if you get one of this topics wrong, another question of this topic is going to appear in the exam.

anyway, great work and very interesting results!!
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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16 May 2010, 15:24
This is awesome! Keep it up!!!
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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23 May 2010, 09:26
Just got a 50q on the GMAT Prep. I took it without trying to find patterns. Also, I only ran into 2 questions I had seen previously. One I got wrong and one right, but not on purpose. I took the questions as I got them. Here is some info. in case it helps.

2 out of the 1st 10 wrong: #3 and #8
Then got on a hot streak until I reached #20, which I missed
I also missed #22
Then I missed #28, 29, 31

Total 7 Incorrect:
More importantly 2 out of the 1st 10 were incorrect. Still got a 50 so don't know if that proves it's a matter of streaks more than anything else (or not missing too many consecutively)

1st two verbal questions were very easy. I then skipped the rest of the questions.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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23 May 2010, 15:07
7 incorrect still 50, that's great.

Best we could do is to take one extra minute just after the question we are sure of being incorrect or randomly guessed.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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23 May 2010, 17:32
Wow guys, this is awesome. Now I won't stress quite as much when I'm panicking over an early quant question.. wait no, I still will :[
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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23 May 2010, 23:09
brianfried wrote:
Wow guys, this is awesome. Now I won't stress quite as much when I'm panicking over an early quant question.. wait no, I still will :[

But I would still suggest you to kill the initial questions with extra caution and make sure you don't miss consecutive questions. It should be intersperse throughout.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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25 May 2010, 03:07
I took 2 GPREPs in the last 3 days.

GPREP 1 - Q43 - Overall 20 Wrongs. 7 Wrongs in the 1st 20. Last 10 (28 - 37) - All wrong. Ran out of time, had to guess them.

GPREP 2 - Q42 - Overall 13 Wrongs. 8 Wrongs in the 1st 20. Only 3 Wrongs in the last 10. None consecutive wrong in last 10.

I had a good feeling about Quant this time. I was expecting 46 - 47. Bump, it was 42 and 1 less than previous attempt despite fewer Incorrects.

This goes to say that 1st 10 or maybe 1st 20 matters, cuz the software fairly fixes your range by this time and your performance in the last 10 or 7 doesnt really help or hurt much.

One more observation in both Quant attempts, I got 2 consecutive wrongs 3 times in the 1st 20. Maybe consecutive wrongs further helped to downgrade my Quant level - range.

GPREP 1 - V38 - Overall 14 Wrongs. Got all RC right. SCs - 8 Wrong. CRs - 6 Wrong. I spent lot of time on RCs, hence ran out of time towards the end and had to guess like 10 Questions.

GPREP 2 - V35 - Overall - 12 Wrongs. RC - 4 Wrongs. SCs - 6 Wrong. CRs - 2 Wrong.
I wanted to replicate the same here. Get all RCs right by spending more time so that I can assure myself of V36 atleast. But 1 RC came after 33 and had to guess those 3 or 4 of those RC Qs and ended up with 2wrong out of it. I think if I had replicated the same here, like all RCs right, I would have hit V38.

What do you guys think of this Verbal strategy? I know not the best of strategy, but if RC was my strength, why not put that wee bit extra time to minimize the RC errors like only 1 or 2 RC errors.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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27 May 2010, 10:27
GMATPREP1 I have taken last Sunday (without the AWA):

Q50- 6 errors: 2 in the first 15Q's, 1 between 16-30 and 3 between 31-37. (3PS, 3DS)
V42: - 5 errors: evenly distributed: 3SC, 1RC, 1CR.

As a rule of thumb, when you are hitting the top scores in Quant, around (+-2) 12 wrong questions give 49, 6 wrongs questions give 50 and 3 wrong questions 51.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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27 May 2010, 21:21
My 2 cents observation with Powerprep.

I gave 2 test of powerprep.

Test 1 - Score 690, Q 49, V 34
7 Quant questions were answered incorrectly - 7, 8, 9, 11, 30, 32, 35
13 Verbal questions were answered incorrectly - 3, 9, 16, 17, 19, 20, 21, 23, 31, 33, 38, 40, 41

Test 2 - Score 690, Q 49, V 34
5 Quant questions were answered incorrectly - 5, 11, 14, 19, 36
8 Verbal questions were answered incorrectly - 1, 6, 11, 13, 19, 29, 34, 38

With less incorrect answers in test 2, I guess I should have scored higher. But then carefully observing the number of incorrect answers till question number 5, 10, 15 and 20, it seems that the score is almost finalized till ques number 20. Accuracy beyond that does not have much impact on the score.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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28 May 2010, 01:12
Tarun, the scoring algorithm in PowerPrep is completely different from that of the GmatPrep. I got only one question wrong in Q but the PP gave me only 50.
Although PowerPrep is good for studying in an early phase, its questions no longer represent the current GMAT, which is then more similarly represented by the GmatPrep.

tarun wrote:
My 2 cents observation with Powerprep.

I gave 2 test of powerprep.

Test 1 - Score 690, Q 49, V 34
7 Quant questions were answered incorrectly - 7, 8, 9, 11, 30, 32, 35
13 Verbal questions were answered incorrectly - 3, 9, 16, 17, 19, 20, 21, 23, 31, 33, 38, 40, 41

Test 2 - Score 690, Q 49, V 34
5 Quant questions were answered incorrectly - 5, 11, 14, 19, 36
8 Verbal questions were answered incorrectly - 1, 6, 11, 13, 19, 29, 34, 38

With less incorrect answers in test 2, I guess I should have scored higher. But then carefully observing the number of incorrect answers till question number 5, 10, 15 and 20, it seems that the score is almost finalized till ques number 20. Accuracy beyond that does not have much impact on the score.

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Re: (Un) Scientific analysis of gmatprep [#permalink]

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31 May 2010, 09:55
Today, I was revising my 2 GMATPrep tests and I found the following order of CR questions (though approx 80% correct):

A P E W S I W A BF S E = 11 Questions
A=2
P=1
E=2
W=2
S=2
BF=1
I=1

C S W BF BF A W S S A F(A) = 11 Questions
C=1
S=3
W=2
BF=2
A=3

Assumption = A
Evaluate = E
Weaken = W
Strenthen = S
Inference = I
Bold Face = B
Conclusion = C
Fill In the Blank(Assumption based) = F(A)

So, I think more than majority of the questions is from A, W and S. If you do well in CR, then expect rest from BF, E parts.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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31 May 2010, 23:58
bb wrote:
And also to build on top of this, the algorithm of GMATprep is not the same as the real GMAT (though very similar in terms of evaluating your abilities but not as through).

Many believe this was done to prevent reverse engineering.

MBAUncle wrote:
Tarun, the scoring algorithm in PowerPrep is completely different from that of the GmatPrep. I got only one question wrong in Q but the PP gave me only 50.
Although PowerPrep is good for studying in an early phase, its questions no longer represent the current GMAT, which is then more similarly represented by the GmatPrep.

tarun wrote:
My 2 cents observation with Powerprep.

I gave 2 test of powerprep.

Test 1 - Score 690, Q 49, V 34
7 Quant questions were answered incorrectly - 7, 8, 9, 11, 30, 32, 35
13 Verbal questions were answered incorrectly - 3, 9, 16, 17, 19, 20, 21, 23, 31, 33, 38, 40, 41

Test 2 - Score 690, Q 49, V 34
5 Quant questions were answered incorrectly - 5, 11, 14, 19, 36
8 Verbal questions were answered incorrectly - 1, 6, 11, 13, 19, 29, 34, 38

With less incorrect answers in test 2, I guess I should have scored higher. But then carefully observing the number of incorrect answers till question number 5, 10, 15 and 20, it seems that the score is almost finalized till ques number 20. Accuracy beyond that does not have much impact on the score.

Posted from my mobile device

I do agree with this. I m sure real gmat must be penalizing students who do random guesses with delay < 10sec.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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01 Jun 2010, 09:54
bb wrote:
And also to build on top of this, the algorithm of GMATprep is not the same as the real GMAT (though very similar in terms of evaluating your abilities but not as through).

Many believe this was done to prevent reverse engineering.

MBAUncle wrote:
Tarun, the scoring algorithm in PowerPrep is completely different from that of the GmatPrep. I got only one question wrong in Q but the PP gave me only 50.
Although PowerPrep is good for studying in an early phase, its questions no longer represent the current GMAT, which is then more similarly represented by the GmatPrep.

tarun wrote:
My 2 cents observation with Powerprep.

I gave 2 test of powerprep.

Test 1 - Score 690, Q 49, V 34
7 Quant questions were answered incorrectly - 7, 8, 9, 11, 30, 32, 35
13 Verbal questions were answered incorrectly - 3, 9, 16, 17, 19, 20, 21, 23, 31, 33, 38, 40, 41

Test 2 - Score 690, Q 49, V 34
5 Quant questions were answered incorrectly - 5, 11, 14, 19, 36
8 Verbal questions were answered incorrectly - 1, 6, 11, 13, 19, 29, 34, 38

With less incorrect answers in test 2, I guess I should have scored higher. But then carefully observing the number of incorrect answers till question number 5, 10, 15 and 20, it seems that the score is almost finalized till ques number 20. Accuracy beyond that does not have much impact on the score.

Posted from my mobile device

Yes, so pretty much approach the real exam the same. Limit guesses. Finish exam. Answer each question as given without trying to "figure out" the exam.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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29 Jul 2010, 06:32
My experience with GMATPrep Today
780 Q50 V48
On Quant missed 10 (3,5,14,18,19,23,30,32,35,37)
On Verbal missed 1

The last 10 Quant were mainly lucky guesses, when I went back and looked at them again, they seemed much easier than the first few. In fact I am currently researching the correct answer for number 3. I still haven't figured it out.
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Re: (Un) Scientific analysis of gmatprep [#permalink]

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29 Jul 2010, 18:05
jallenmorris wrote:
bsd_lover

This is an awesome experiement! You should get some major kudos for this.

yes! keep it up!
Re: (Un) Scientific analysis of gmatprep   [#permalink] 29 Jul 2010, 18:05

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