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# NEW: MGMAT's Analysis of Official Guide 13th Edition

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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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21 Mar 2012, 07:04
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Hey guys,

For everyone's convenience, I've taken our latest OG13 analysis from our blog and posted it below. I don't want you to miss this stuff. Stay tuned for more in the weeks to come...

Manhattan GMAT’s Analysis of the 13th Edition Official Guide

The 13th Edition of the Official Guide for GMAT Review has finally been released publicly. Here at Manhattan GMAT, we’ve done an initial analysis of the OG13 book.

OG13 contains 907 practice problems for the “main” part of the GMAT (Quant & Verbal). Of those 907 problems, only 17% are new. Since you know your fraction equivalents, we don’t have to tell you that 17% is about 1 out of 6.

Out of 907 problems, 749 are repeats (yes, that’s 5 out of 6). If you already have the 12th Edition, a good way to look at the 13th Edition is as a source of 158 great new practice problems. We’ve listed them by number at the end of this post.

Much of the book is unchanged from the 12th Edition:

For repeated problems, the explanations are identical, except for a few extremely minor edits (e.g., fixing an error in numbers chosen to test Statement 1 in DS #135).
Various sections, such as the Diagnostic Exam (all 100 problems), Math Review, Test-Taking Strategies and Directions, are unchanged.
Each of the 5 major types (PS, DS, RC, CR, and SC) has the same number of problems as before: 254 PS, 198 DS, 156 RC, 141 CR, and 158 SC.
Excluding the Diagnostic Exam, practice questions are organized by difficulty, according to the GMAC—just as they are in the 12th edition—but with an asterisk we’ll explain below.

We’ve done all the new problems, and they’re just what you’d expect — good, clever GMAT problems. Each one has its own unique flavor, but they’re all from the same big box of cookies. Given that only 1 in 6 are new, we don’t ascribe too much meaning to the unavoidable micro-shifts in topical balance.

Do not over-interpret changes from OG12 to OG13! Some variation is to be expected. Nothing suggests a shift in how you should prepare for the exam.

2. Transition If And When You’re Comfortable

If you’ve been getting ready with the 12th Edition, treat the 13th Edition as a source of additional practice. But you do not need to switch, especially if your exam is before June 5, when the new GMAT arrives.

If you’re taking an “old” GMAT, consider mining the 13th Edition for a few new problems. But your time may be better spent reviewing practice problems you’ve already encountered. Or you might just do online practice with GMATPrep, GMATFocus, or practice exams such as ours.

3. Integrated Reasoning is Integrated

If you are taking the “new” GMAT (on or after June 5), the OG13 has some relevant goodies for you: a short introduction to IR, plus access to 50 brand-new practice problems online. Even though the IR section won’t count for much in the admissions process, you don’t want to face it completely cold. Running through these 50 problems will help warm you up.

In fact, you might catch fire and start freaking out about IR. If that happens, go dunk your head in water. IR is not that important. You just want to give it a decent shot. Save your strength for the main event of the GMAT.

4. Order Oddities

Both OG12 and OG13 claim to be laid out in order of difficulty (except for the 100 Diagnostics). Since all the problems are retired from the real exam, that order should never change—so you’d expect repeated problems to maintain their relative positions in the hierarchy.

Weirdly, though, 25 repeated problems have jumped out of position.

View the comparison table here: http://www.manhattangmat.com/blog/index ... ial-guide/

While we’ve understood and agreed with the OG difficulty ordering in broad strokes, we’ve always wondered about some of the specific rankings. Is Marcia’s Bucket (DS #174) truly the hardest DS problem on the planet, three editions running—11th, 12th, and 13th? That one has always bewildered us.

The reshuffle is generally in the right direction, if we were doing the ranking of those 25 problems. For instance, we think that PS #69 in the 12th is harder than PS #196 in the 12th, not conceptually but in actual execution. Old #69 is tricky! Now the new numbering (#109 and #55, respectively, in OG13) reflects that opinion.

However, the mystery is why this reshuffling is happening at all. If the problems were in relative order of difficulty in one edition, any repeats should stay in that order till the end of time—since the problems are most definitely retired!

This weird reordering happened before on a smaller scale, when the supplemental Review OGs transitioned from 1st to 2nd Editions. One problem in each slipped out of position. That level of change could be chalked up to clerical error or to random genetic mutation caused by a stray cosmic ray or what have you.

However, with 25 problems on the quant side (and none on the verbal side) acting illogically, we can only guess at something larger. It should be straightforward for the GMAT to measure difficulty—it’s a basic parameter for each question, a single number developed during the problem’s experimental stage and then frozen. Perhaps, for a whole batch of questions, these parameters were recorded in a systematically erroneous way, and now GMAC is fixing the problem. Maybe the way GMAC measures difficulty has some quirks to it, and under an update to the algorithm these problems would somehow get a different ranking.

Regardless, we don’t think there’s anything nefarious to all this—there’s no reason that GMAC would deliberately mess with our heads. After all, the 10th Edition of the OG, for those of us who go back that far, was comfortably chaotic. It had no order whatsoever. The 11th Edition was the first one that the GMAT folks put in order of difficulty—and we all welcomed that change. It made studying so much more productive to know how hard a problem was to the GMAT, if only in relative terms.

As we find out more on this matter, we’ll let you all know.

5. Stay Tuned

More generally, as we dig further into OG13, we’ll keep you posted on any juicy discoveries. Again, we don’t want to squint too hard at the tea leaves. We’ll start seeing things that aren’t really there: “Is there one more or one less Probability problem, and what signal is the GMAT sending…?” That road leads to madness. This OG is pretty much the same as the last one, just with some new good problems in it.

6. New Problems

And now, what you’ve been waiting for… here are the new problem lists, all by number in the OG13. We’re moving a couple of topics around ourselves, so these breakouts reflect the upcoming topical alignments.

Problem Solving: 12, 13, 14, 15, 37, 49, 56, 57, 60, 61, 69, 71, 75, 77, 78, 79, 80, 81, 91, 92, 108, 110, 112, 113, 114, 117, 118, 119, 127, 128, 129, 137, 158, 163, 166, 170, 177, 178, 182, 183, 196, 198, 199, 218, 229

PS Fractions, Decimals, & Percents: 15, 56, 57, 71, 80, 108, 113, 114, 163, 170, 177, 182, 198, 218
- Digits & Decimals: 163, 170, 218
- Fractions: 15, 80, 108
- Percents: 57, 71, 114, 177, 182, 198
- Ratios: 56, 113

PS Algebra: 14, 37, 117, 129, 196, 199
- Linear Equations: 14
- Exponents & Roots: 196
- Quadratic Equations: 37, 117, 199
- Formulas: 129

PS Word Problems: 12, 49, 60, 79, 81, 91, 112, 119, 137, 158, 178, 183
- Algebraic Translations: 60, 137
- Rates & Work: 49, 79, 81
- Statistics: 12, 91, 112, 119, 183
- Consecutive Integers: 158
- Overlapping Sets: 178

PS Geometry: 13, 61, 69, 75, 78, 92, 166
- Polygons: 13, 78, 166
- Triangles & Diagonals: 75, 92
- Circles & Cylinders: 69
- Coordinate Plane: 61

PS Number Properties: 77, 110, 118, 127, 128, 229
- Divisibility: 77, 110, 118, 127
- Positives & Negatives: 229
- Combinatorics: 128

Data Sufficiency: 11, 15, 18, 20, 22, 23, 24, 25, 29, 32, 33, 34, 37, 39, 41, 42, 52, 57, 65, 70, 74, 75, 79, 80, 83, 85, 92, 96, 97, 99, 102, 109, 123, 131, 133, 141

DS Fractions, Decimals, & Percents: 23, 25, 29, 75, 80, 92, 131, 133
- Digits & Decimals: 75, 80, 133
- Fractions: 29, 92, 131
- Percents: 25
- Ratios: 23

DS Algebra: 15, 24, 33, 41, 52, 85, 96, 99
- Exponents & Roots: 15, 41
- Formulas: 24, 96
- Inequalities: 33, 52, 85

DS Word Problems: 18, 20, 22, 34, 37, 57, 65, 70, 109, 123, 141
- Algebraic Translations: 57, 65, 141
- Rates & Work: 22
- Statistics: 20, 37, 70, 109, 123
- Consecutive Integers: 18
- Overlapping Sets: 34

DS Geometry: 11, 42, 74, 79, 102
- Polygons: 42
- Triangles & Diagonals: 79
- Circles & Cylinders: 102
- Coordinate Plane: 11, 74

DS Number Properties: 32, 39, 83, 97
- Divisibility & Primes: 83
- Positives & Negatives: 97
- Odds & Evens: 32
- Probability: 39

Reading Comprehension: 1, 2, 3, 4; 11, 12, 13; 14, 15, 16, 17; 37, 38, 39, 40, 41; 52, 53, 54, 55; 84, 85, 86; 111, 112, 113, 114 (passages separated by semicolons)

7 new passages
- Length: 2 long, 5 short (3 of the shorts are just 1 big paragraph, though!)
- Themes: 2 biological science, 2 business, 2 social science, and 1 physical science

Question types:
7 General questions (4 Main Idea, 3 Structure) – roughly 1 per new passage
20 Specific questions (8 Detail, 12 Inference) – roughly 3 per new passage

Since you’d never do all the questions of 1 type at once (you always do RC by passage), there’s little point in breaking them out by number.

Critical Reasoning: 1, 3, 6, 8, 9, 11, 12, 17, 19, 22, 29, 33, 39, 49, 59, 65, 69, 74, 81, 86, 94, 100, 106, 114, 124
- Assumption: 106
- Evaluate the Argument: 114, 124
- Flaw: 8, 100
- Strengthen: 1, 11, 19, 29
- Explain the Discrepancy: 3, 6, 9, 17, 22, 49, 86, 94
- Complete the Argument: 12, 33, 39, 59, 65, 69, 74, 81

Sentence Correction: 1, 2, 4, 7, 9, 15, 19, 26, 35, 38, 40, 48, 56, 65, 68, 71, 74, 79, 87, 97, 107, 111, 114, 132, 138
- Subject-Verb Agreement: 7
- Parallelism: 4, 15, 38, 56, 74, 79, 87, 138
- Pronouns: 111, 114
- Modifiers: 1, 19, 35, 48, 65, 68, 132
- Verbs: 40, 71
- Comparisons: 9, 107
- Connecting Punctuation: 2, 26, 97
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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21 Mar 2012, 07:40
What about scoring criteria for IR?
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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21 Mar 2012, 07:43
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01dynamic wrote:
What about scoring criteria for IR?

IR will be separately scored from the rest of the GMAT so it will not count towards your overall 200-800 score. The GMAT will release more news on this in April.

You should know that IR is only moderately important for now. Most likely, admissions officers will put only moderate importance on IR at first, until they observe how performance on the IR section correlates with academic performance in business school.

If you want to know more about IR such as question types, etc., we've posted more info on our website: http://www.manhattangmat.com/ir.cfm

Best,
Matt
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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21 Mar 2012, 07:47
MGMAT always ahead thank you very much for sharing it!
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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21 Mar 2012, 09:40
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Expert's post
Thank you.
I have added my review to Amazon here: http://www.amazon.com/review/R190US92KL ... ive=390957
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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21 Mar 2012, 12:34
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Expert's post
I have posted my review on Amazon:
http://www.amazon.com/review/R190US92KL ... ive=390957

Also, feedback from GMAC:

1. No plans for Kindle OG 13 version in the next immediate future; unclear
2. Currently, no plans to update the OG Supplements such as OG Verbal and OG Quant.

Feedback from Wiley Publishing:
1. The kindle edition should be out soon (less than 30 days perhaps?)

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Last edited by bb on 21 Mar 2012, 14:21, edited 1 time in total.
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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31 Mar 2012, 20:01
Has GMAC completely phased out idioms from OG13?
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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02 Apr 2012, 06:51
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mittal82 wrote:
Has GMAC completely phased out idioms from OG13?

They have stripped out only US-centric idioms. (When they first made the announcement, they said idioms in general, but they later clarified that they only took out US-centric idioms.)

They have not provided a list of which idioms they consider US-centric, but the list in our SC guide does not include any that I would definitely call only US-centric. By the way, we compiled our list from OG12 - so you can study from either one!

Best,
Matt
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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12 Apr 2012, 11:10
Great work. It will help the test takers.
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Collections of work/rate problems with solutions http://gmatclub.com/forum/collections-of-work-rate-problem-with-solutions-118919.html
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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12 Apr 2012, 14:52
Thanks for all the valuable info!
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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18 Apr 2012, 00:52
With regards to the references that MGMAT makes to OG12 in its books, do these references carry over to OG13? In other words, I was going to get the OG13, but wasn't sure if the MGMAT references to certain problems in OG12 match up in OG13.

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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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18 Apr 2012, 06:49
Hey,

Much of the book is unchanged from the 12th Edition. Excluding the Diagnostic Exam, practice questions are organized by difficulty, according to the GMAC—just as they are in the 12th edition—but 25 problems have changed position.

You can find the comparison table in this MGMAT blog article: http://www.manhattangmat.com/blog/index ... ial-guide/

In short, you'll be fine using the 13th edition. Just remember that 25 questions have changed position so you'll want to use the comparison table.

Hope this helps!
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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18 Apr 2012, 09:50
Great info! looking forward to the new MGMAT books to come out at the end of April to purchase the set.
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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29 Apr 2012, 13:53
So I recently purchased the OG13 and was about to start doing problems referenced in MGMAT's Number Properties book. Specifically, on pg. 104 on Number Properties, it references problems 76, 82, 90, etc. in OG12 Data Sufficiency.

I looked at the Comparison Table you mentioned to see if any of these problems (or at least #76, 82, and 90 in the MGMAT Number Properties book) had been moved. It appears that they have not moved via the Comparison Table. However, when I checked the OG13, it seems like these are different problems.

I am wondering: am I using the comparison table incorrectly, or are there more problems out of place than I thought?
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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29 Apr 2012, 14:24
Thanks for the information. I will look to list these questions that I can solve in my OG and then proceed further. Thanks once again.
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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30 Apr 2012, 15:03
To all those who have this book, do you still recommend buying OG13 ?
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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30 Apr 2012, 15:07
Zynga: Let's wait until I receive a reply to my above inquiry. I am under the impression that there are more questions that have moved positions than the above comparison table mentions.
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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01 May 2012, 08:06
Thanks for the analysis
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition [#permalink]

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26 Mar 2017, 23:40
Thank you mmapplebeck. I think it will help me too much.
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Re: NEW: MGMAT's Analysis of Official Guide 13th Edition   [#permalink] 26 Mar 2017, 23:40
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