### 4 Common Types of Data Sufficiency Traps

If the GMAT were a sport, it would definitely be baseball, and not just because it’s three and a half hours long. In baseball, you might dominate the minor league by hitting fastballs, but once you reach the show you’ll have to hit some change-ups and curveballs too. Not only is the GMAT going to throw you some hard problems, but once you start to do well, the GMAT will throw you something different. That’s why learning the types of trap answers can help you from falling for them. Here’s four types of curveballs that you want to be mindful of on test day.

### Challenge Problem Showdown – July 30th, 2012

We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!

Here is this week’s problem:

In the country of Celebria, the Q-score of a politician is computed from the following formula:

Q = 41ab^{2}c^{3}/d^{2}, in which the variablesa, b, c,anddrepresent various perceived attributes of the politician, all of which are measured with positive numbers. Mayor Flower’s Q-score is 150% higher than that of Councilor Plant; moreover, the values ofa, b,andcare 60% higher, 40% higher, and 20% lower, respectively, for Mayor Flower than for Councilor Plant. By approximately what percent higher or lower than the value ofdfor Councilor Plant is the corresponding value for Mayor Flower?

### Everything You Need To Know About Time Management (Part 2)

*Did you know that you can attend the first session of any of our online or in-person GMAT courses absolutely free? We’re not kidding! Check out our upcoming courses here.*

In the first part of this series, we discussed time positions (positive, negative, and neutral) and addressed our first three major considerations for timing:

**(1)** understanding the scoring (and what implications that has for timing)

**(2)** per-question timing and tracking your work

**(3)** reflecting on your results so that you can improve

If you haven’t already read the first part, do so now before you continue with this article. Today, we’re going to talk about our final three major timing strategies.

**(4) Develop your 1 minute** **sense**

While keeping a single-problem time log will help you become aware of your pacing on all question types, you can’t check the clock after every problem on the real test. You’ll drive yourself crazy before the test is over! What to do, then?

What we’re going to do is develop a time sense so that we can make appropriate, timely decisions as we move through the test. Let’s talk first about why and how we use this time sense; then, we’ll talk about what we need to do in order to develop it.

Note: Most people find it takes three to four weeks of regular practice with this in order to develop a time sense that is reasonably accurate most of the time.

*WHY are we developing a 1-minute sense?*

### Everything You Need To Know About Time Management (Part 1)

*Did you know that you can attend the first session of any of our online or in-person GMAT courses absolutely free? We’re not kidding! Check out our upcoming courses here.*

#### This is the original version of a piece that has since been updated. See Stacey’s latest tips on GMAT time management.

I haven’t picked too ambitious a title there, have I? Let’s see how we do!

### Challenge Problem Showdown – July 23rd, 2012

We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!

Here is this week’s problem:

Xis a three-digit positive integer in which each digit is either 1 or 2.Yhas the same digits asX, but in reverse order. What is the remainder whenXis divided by 3?(1) The hundreds digit of

XYis 6.

(2) The tens digit ofXYis 4.

### Are You Taking Too Many Practice GMATs?

My GMAT students are often surprised when I advise them not to take a practice test.

I don’t advise this for every student on every occasion; there are some legitimate uses for practice tests. In general though, I find that my students take too many practice tests at the expense of other more beneficial forms of study for a given circumstance.

Think of the GMAT like a Mozart sonata. Let’s say you are a pianist, and you want to learn the sonata. Would you begin by playing the whole piece from start to finish? No, instead you would work in small sections. You would identify the sections that are easy, and you would work on those sections just enough to maintain your ability. Mainly, you would be concerned with the difficult sections of the piece, which you would practice slowly and intently. Not until you had mastered those sections would you move on.

After you have put in all that practice time, you want to make sure that you can maintain your ability within the context of the larger piece. That’s when you want to play the whole piece: when you want to check to see whether your prior work is ingrained or whether you forget it when you are distracted by the other demands of the piece.

### Flaw Questions on GMAT Critical Reasoning

We’ve talked about various types of Assumption Family questions in the past (find the assumption, strengthen, weaken, and evaluate the conclusion), but we haven’t yet tackled a Flaw question. This is the least frequently tested of the 5 Assumption Family question types, so you can ignore this type if you aren’t looking for an extra-high score. If you do want an 85^{th}+ percentile verbal score, though, then you have to make sure you know how to tackle Flaw questions.

If you haven’t yet, read this article before we try our GMATPrep problem. Then set your timer for 2 minutes and go!

### GMAT Lessons from Detective Shows

When not providing insight into the fascinating world of the GMAT, I enjoy watching detective shows on television. In many episodes, one of the detectives must delve into the mind of the perpetrator “ actually try to think as the perpetrator does. In so doing, the seemingly random clues come together (often via a slow motion or black and white flashback scene) leading to an insight that breaks the case.

I am going to advocate taking on this television detective mentality in approaching GMAT problems. Perhaps there is a further parallel as the mind of the GMAT question writer may seem to be just as scary a place as the mind of a criminal. But the ability to think like a GMAT test writer can provide multiple benefits including enabling you to get more questions right and allowing you to have more confidence in your answers.

So let’s try think about three lessons we can take from our favorite crime dramas and apply to the GMAT.

### Challenge Problem Showdown – July 16th, 2012

We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!

Here is this week’s problem:

A decade is defined as a complete set of consecutive nonnegative integers that have identical digits in identical places, except for their units digits, with the first decade consisting of the smallest integers that meet the criteria, the second decade consisting of the next smallest integers, etc. A decade in which the prime numbers contain the same set of units digits as do the prime numbers in the second decade is the

### The Most Important GMAT Question I Ever Studied

Every Manhattan instructor is probably able to fondly recall the Official Guide book that they used to ace their GMAT. Or at least that’s what I would have used to say. Now I know that every Manhattan instructor is probably able to fondly recall the Official Guide book that he or she used to ace his or her GMAT. For me it was the school bus-yellow 11th edition that included the most important question I ever studied. If you have the 12th edition of the Official Guide, it’s question #124. The answer choices on this question began with the following split:

sloths hang from trees…

vs

the sloth hangs from trees…