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How To Approximate Your OG Diagnostic Test Performance To The 800-Scale

As mentioned in this post, the first step of your GMAT Prep begins with taking a Diagnostic Test. This need not be a computer adaptive test, the paper-based Diagnostic Test on the OG will suffice.

A few rules that need to be followed while taking the test:
• Take the test when you are fresh so that you can get the most accurate measure of your competence; you should not have anything other than your own ability to attribute a sub-par performance to.
• The test can be taken either as two sections – Quant and Verbal with any length of break in between (even a day or two) – or as five question-types (PS, DS, RC, CR & SC).
• Do not break the test either in the middle of a section or in the middle of a question-type.

Your performance across five categories will be categorized as shown in the table below.
GMAT DT Interpretive Guide

Before we approximate this performance to a score on the 800-scale we have to take a few things into consideration that make this Diagnostic Test easier than the computer-based GMAT:

• It is of a shorter duration — about an hour less.
• It is not adaptive, giving you the freedom to go back and forth between questions, something that is not possible on computer-based test.
• It is paper-based test, making it less cumbersome than viewing on a screen and using scratch pad to solve and calculate or even reading passages off a screen.

Given these reasons, the GMAC itself has the following things to say about the Diagnostic Test:

The Diagnostic Test is designed to give you guidance on how to prepare for the GMAT exam; however, a strong score on one type of question does not guarantee that you will perform as well on the real GMAT exam. The statistical reliability of scores on the Diagnostic Test ranges from 0.75 to 0.89, and the subscale classification is about 85%–90% accurate, meaning that your scores on the Diagnostic Test are a good, but not perfect, measure of how you are likely to perform on the real test.

So factoring in all these things, I have prepared a conversion chart that scales down the performance on this test to account for the relatively easy nature of this test in such a way that even if you answer every single question on the DT correctly, it will equate only to a 750.

The table below will give you an estimate of your scaled scores on Quant & Verbal separately based on the number of questions you answer correctly.

DT Conversion

You can use the scaled scores you arrive at using the table above to calculate your total score based on the charts given in this post.

This should give you a reasonably accurate estimation of your score on the 200-800 scale.

How To Structure Your GMAT Prep

A goal without a plan is just a wish – Antoine de Saint-Exupery

If there is one thing that is absolutely essential to successfully prepare your way to a great GMAT score it is a structured GMAT Study Plan that is executed perfectly.

It is tough to make a one-size-fits-all study plan for those who want to prepare on their own. Instead we will take up each of the elements of your preparation and discuss those in detail.

What you should not do
Given that the GMAT is predictable and there is a seemingly huge quantity of actual GMAT questions to practice along two official free tests the usual pattern that test-takers follow unfolds as follows.

Take a mock test without any preparation – some test-takers use the first test from the GMAT Prep Software, others use a free test from a reputable source such as Kaplan, some others just take any random GMAT Mock that they can find.

Firstly, no test from any player in the market actually simulates the GMAT. The failure occurs on two counts: the questions are not consistently tailored to the GMAT logic and lack of knowledge of the exact adaptive algorithm (which of course is proprietary to the GMAC) that the GMAT uses. So any unofficial test that you take is not a reliable indicator of your ability.

If you take the GMAT Prep Software test, you will waste one full-length test right at the beginning of your preparation instead of saving it for later.

After taking this mock, test-takers gather prep materials from various sources and swing back and forth between taking tests and preparing.

After a few months of this, a certain proportion just go ahead take the actual test to see how it goes, others decide that they need some professional help and then try some test-prep courses, still others postpone their plans!

I am not saying that this plan will not work; it will work only if you hit a 680 or above on the first test you take.

The Elements Of A Successful GMAT Prep
A GMAT attempt can be called a successful if you reach the minimum possible score for your potential in your first attempt. There is a reason we have defined it as minimum possible and not maximum possible score. Every test-taker will potentially fall into a band in terms of the score he or she can get. On test day, unless anything goes wrong dramatically, he or she will fall into that band. This band is usually 20 points wide. So your range can be 680-700 or 700-720 and so on. There will always be exceptions to this but in most cases this range holds true.

To achieve this minimum possible score you need to do implement the plan below:

Step 1: Take the Paper-Based Diagnostic Test From the Official Guide & Identify Your Learning Needs
While it is imperative that one takes a Diagnostic Test, it does not need to be full-length computer-adaptive test. The objective is not to a get a precise score to benchmark your ability but to measure your ability on the 5 question-types posed on the GMAT and identify your learning needs. For this the paper-based Diagnostic Test at the beginning of the OG should more than suffice.

The Diagnostic Test can be taken one section at a time or one question-type (PS, DS, CR, RC & SC) at a time. Do not take start a question type and leave it mid-way. Do not take it as a full-length test unless you have the stamina and time to sit through. The idea is to get a measure of your competence based on knowledge and aptitude, which can get compromised if you are mentally tired.

Based on the number of questions you answer correctly you will get a rating for your competence level in each area: Excellent, Above Average, Average, Below Average. This will give you an idea about your relative strengths and weaknesses.

For Quant you would need to deep dive beyond PS & DS into the mistakes to determine the specific topics on which you need to work on such as Rate & Work, Statistics etc.

This post will outline how to approximate your performance on the OG Diagnostic Test to the 800-scale.

Step 2: Build Concepts & Strategies

Once you have identified your level of competence in each of the areas you should start learning the concepts & strategies required to solve each question type.

Most test-takers confuse the practice stage with this stage — they either start solving questions from the OG, trying to learn as they solve or do the learning and solving simultaneously.

Both these approaches are incorrect. For example, there is a certain technique to solve DS questions in such a way that you do not make any mistakes. The same applies to solving a Weaken Question on Critical Reasoning question or Sentence Correction question testing Parallelism.

The GMAT looks very straightforward to most test-takers —
• Quant is barely X-grade level, I just need to cut down on silly mistakes
• Critical Reasoning is just common sense
• Sentence Correction is anyways about gut-feel, whenever I make a mistake I can look at the explanatory answer and learn
• Reading Comprehension — well who wants solve that anyways

So I can start solving and learning in parallel (I know this does not apply to all but it does to most). In a way the approach mirrors the approach to a video game; just keep trying and eventually you will hit the higher levels.

The only problem with this method is that you will run out of actual GMAT questions very soon without actually learning anything.

One of the things about preparing for the GMAT is that very few practice question banks in the market actually simulate the GMAT logic. Given this it is imperative that whatever little Official Material is available be used judiciously.

So your next questions should be what prep material should you use to build concepts & strategies and whether classroom prep is required for the GMAT. We will take both of these questions up in forthcoming posts.

Step 3: Practice with a purpose
Once you are through with your concept prep you need to start practicing questions from the Official Guide. But this practice must be done with a certain amount of thought and purpose

Normally test-takers practice one question type at a time in huge chunks, say, 40 CR questions in a row or 30 SC questions in a row before moving on to other question-types.

The problem with this is that this is not the format in which you face questions in the test.

On the actual test you will reach the Verbal Section only after 2.5 hours of testing. This in itself is the biggest hurdle for Indian test-takers. The amount of reading that the Verbal section requires takes more out of most Indian test-takers than out of test-takers who are native speakers of the English language.

Your practice routine as much as possible will have to mimic the actual test conditions and pattern as much as possible.

You can use the following practice routine with a 5-minute break between the Quant and Verbal sections:

GMAT Practice Routine

The above practice routine is intended to help you simulate the actual test conditions, as much as possible, right from the beginning of your practice and not when you start taking full-length tests. As you proceed in your prep (about half-way through the OG), you should add AWA & IR questions to your practice routines.

Step 4: Testing To Improve
As discussed in the previous post your would need at the least a 30-45 window for your testing period.

The most crucial part of this exercise is how you analyze your tests and identify exactly what you need to do to improve your score.

For example, test-takers often say that in Quant they make silly mistakes — an equivalent of an unforced error in tennis. But beyond this they do not seem have a strategy to cut down on them. Suppose a tennis-player is making unforced errors and you need to fix this you need go beyond the surface:

• Are there more errors on the forehand or backhand?
• Do they go more into the net or does he/she hit them long?

From such question sit is possible to figure out the technical problem behind these seemingly unforced errors. Even on the GMAT Quant silly mistakes are not purely a matter of oversight.

For example, you might be actually reading the question incorrectly – you start reading the question at the right pace and concentration but as you reach the end of it you read it in a hurry and skim details in order to start solving it.

Most test-takers during their test review will just categorize this as – Oh I could have easily got this there is nothing I need to learn, it is just a silly mistake. Very few silly mistakes are truly silly; a deeper inspection always reveals faulty technique.

We will take this up in detail in a later post on how to achieve maximum score improvement during the testing phase.

Will roll the next few posts related to this post in quick succession. In the meantime those who have not taken the Diagnostic Test in the OG can go ahead and give it a shot. Remember do not solve it casually — take it when your are fresh and take it with full concentration.

What is the optimum time to prepare for the GMAT?

This is the first question that pops up regarding test-preparation, be it for the GMAT or for any other test. The short answer to this question — it will require a minimum of 2.5 months and a maximum of 6 months. Now let’s try to get inside these numbers.

The optimum time needed depends on the test-taker but the prep phase for any test has two components — the prep-phase and the testing-phase. How long should each of these components be? Let’s start by working backwards. Read More

Why You Should Always Start Your GMAT Prep With A Test Date In Mind

The more constraints one imposes, the more one frees one’s self. And the arbitrariness of the constraint serves only to obtain precision of execution – Igor Stravinsky, Composer

The GMAT can be taken the all-year round but test-slots are not available with equal ease all year round — test-slots are easy to get during the first six months of the year (you can get a slot even if you try book today for a slot in a couple of days) but as the year draws to a close it is almost impossible to get a slot of your choice!

Most of you would know the reason for the same — the application deadlines of schools start towards the end of the year (around September). So while we are free to choose a test date of our choice, we refuse to do so for a variety of reasons, some valid and some invalid: Read More

Q & A – The Assumption Question

Let’s discuss! In the previous post, we discussed the standard operating procedure to solve Assumption Questions – The Negation Method. The best way to really test whether you have understood a particular method of solving is to test it against tough questions.

What makes a GMAT CR question tough? A tough question has trap options that are extremely relevant to the passage making it tough to eliminate them. Also, unlike a medium-level question, a tough question might have three close options, two which are very close and one close enough to be in the consideration set. Read More

Critical Reasoning – The Assumption Question 1

The Assumption Question is a Critical Reasoning Question Type on the GMAT® that gives test-takers a certain amount of trouble (the most troublesome being the Boldfaced Question Type). Test-takers often say that they have trouble in attaining a certain level of consistency on this question type. In this post we shall look at a standard operating procedure that will help you increase your accuracy level and choose the right option when faced with two seemingly correct options. Read More

Sentence Correction – Usage 1

This is a common and seemingly easily resolvable grammatical conundrum — when does one use which and when does one use that? Most test-takers who have prepared for GMAT® Sentence Correction will have this answer at the tip of their tongues — essential/restrictive and non-essential/non-restrictive clause.

What they mean is that which is used to state information that is not essential while that is used to state essential information.

A easier way to remember this is by looking at the pair of sentences below:
1. These are the keys to the fourth car in the parking row, which is black.
2. These are the keys to the fourth car in the parking row that is black.

From the first sentence you would get the keys to the fourth car in the parking row; the sentence gives you some additional information, namely that it is black in colour; even without this information you could have known which car you have the keys to — the fourth car in the row. Read More

Critical Reasoning – The Conclusion Question 2

In the previous Critical Reasoning post we discussed one specific kind of logic that is tested on the Conclusion Question Type. In this post we will take a look at the only other type of standard logic tested on the conclusion questions. If you are able to understand apply the technique to solve these two logical structures, most conclusion questions should be a breeze.

Let us take a GMAT Critical Reasoning question to examine this further.

Although aspirin has been proven to eliminate moderate fever associated with some illnesses, many doctors no longer routinely recommend its use for this purpose. A moderate fever stimulates the activity of the body’s disease-fighting white blood cells and also inhibits the growth of many strains of disease-causing bacteria. Read More