Ten ways to score poorly in GMAT

Ten ways to score poorly in GMAT! If you are rich enough for retakes, that is

1. I know math, so no need to go thru the same old arithmetic, algebra, geometry stuff

2.  Tones of free downloads on your pc..what is relevant, what is not, even God may not know..

3. Just official guide, what else, nothing official about it…

4. I will join for the costliest, longest duration course in town…let them get me the score, no need to  study at  home..

5. I wont do the essays while practicing, only math and verbal mock exams  will do

6. I speak and write good English, so verbal is going to be a cake walk, no less

7.  I need just one month for preparation, after all I had high grades in college.

8.  Do as many tests as possible, in fact 90 percent of my preparation time should be spent on tests. concepts? What concepts?

9. My friend said GMAT was easy for him, no tough qns ( hey, what was your friend’s score?)

10. Out of five tests  I  did, one test I scores above 650. So I will give the test as planned.  I believe in luck!

PS Good luck

100 points more GMAT score improvement strategy -3

Part 3

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100 points more GMAT score improvement strategies -2

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100 points more GMAT strategy workshop -1

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Hypothesis testins as a tool for GMAT math problem solving

Certain problems require you to formulate a hypothesis and verify. The relationships between relevant variables which are yet unknown but promise to offer solution in full or in part forms the basis of this method. Such formulations are tested for validity and accepted or rejected. More than one hypothesis can be formulated in a problem context. These hypothesis have to be examined and reformulated.

Errors which occur during hypothesis testing
(1) Overlooking certain data
(2) Overemphasizing data which give positive conclusions while failing to give sufficient importance on data which falsifies information.

The following sum is a tough mathematical problem where skill of hypothesizing information and testing it comes forth.

Fifteen years back Mrs. John had only three daughters Rachael, Annie, Mary and their combined age was half of hers. During the next 5 years, Thomas was born. At that time Mrs. John’s age equaled the total of all her children’s ages. After some years George was born and then Rachael was as old as Mary and Thomas together. And now, the combined age of all the children is double Mrs. John’s age, which is only equal to that of Rachael and Annie together. Rachael’s age is also equal to the combined age of the two sons’.

What is Mrs. John’s age?

1. 39        2. 34          3. 29         4.24

This sum takes a long time if you solve by writing equations.

It can be solved faster by hypothesizing a data and testing the hypothesis wrt to other conditions.

First let us interpret the problem carefully and diagram it.

PROBLEM ANALYSIS

Information which is direct
• 15 years back Mrs. John had only three children Rachael, Mary and Annie. Mrs. John’s age was double the sum of the ages of her children.
• Sometime between 15 and ten years back, Thomas was born. At that time Mrs. John’s age was equal to the sum of the 3 children
• Between 10 years back and present time, George was born. At that time Rachael was as old as Mary and Thomas together.
• At present the combined age of all the children is double Mrs. John’s age. Mrs. John’s age is equal to the sum of Rachael and Annie. Rachael’s age is equal to the sum of George and Thomas

Implicit information
• All the ages are whole positive number, there are no fractions.
• Thomas’s age must be less than 15 and near 15. As 15 years back Mrs. John had only 3 children
• The last statement states that Rachael’s age + Annie’s age = Mary’s age + Thomas’s age + George’s age.
Rachael’s age = George’s age + Thomas’s age and Mrs. John = Rachael’s age + Annie’s age

PROBLEM CONVERSION

Mrs. John -  Time line- Rachael-Annie-Mary-Thomas-      George

T+G+A    -   Present  - T+G    -A      -A      -T         -G

Where T is Thomas age, A is Annies age and G is Georges age
We can conclude that Annie and Mary were twins


We will assume data from the questions
Let us hypothesize that Thomas’s age is 12. (9 is far away from 15).
{If we don’t get the answer using T =12 we can conclude that T = 9. Other options are wrong.}

Lets verify our hypothesis.

Rachael must be the eldest daughter . Let us assume that Rachael age must be 21 other options are close to 15 and as she is the eldest we will assume the biggest number
So George’s age must be 9 ( question 4 seems to be satisfied)

Mrs. John -  Time line- Rachael-Annie-Mary-Thomas-George

                    15 yrs back-6     -

                     12 yrs back-9    -                         -0(Thomas born)

                      10 yrs back-11 -                        - 2

                      9 yrs back - 12 -                        -3     -0(Georges born)

                      5 yrs back  - 16-                        7       - 4

T+G+A              Present  -21 -     A-   A-       12      -   9

Using the info: Between 10 years back and present time, George was born. At that time Rachael was as old as Mary and Thomas together.
It can be concluded that Mary was 9 as 12 = Mary’s age + 3
Hence Annie’s age was also 39

Mrs. John -  Time line- Rachael-Annie-Mary-Thomas-George

                    9 yrs back- 12     -  9      -9     -  3        - 0(Georges born)

Filling our table
All the children’s age 9 yrs back can be calculated.
Their present ages can also be calculated including Mrs. John age

Mrs. John -  Time line- Rachael-Annie-Mary-Thomas-George

39            -  Present   - 21        -18    - 18   -   12      -  9

Mrs. John -  Time line- Rachael-Annie-Mary-Thomas-George

24          -  15 yrs back -  6     -      3  -   3

               -12 yrs back  -  9      -    6   -   6 -  0(Thomas born)

               - 10 yrs back - 11                        -  2

                - 9 yrs back  - 12     -   9    -   9  -  3       -0(Georges born)

               -  5 yrs back   -16                         - 7        -  4

      39       -Present     - 21       -  18    -  18  -12     -   9

Now the table can be completed and the all the answers can be calculated

What is Mrs. John’s age? - 39
What is the age of the eldest daughter? - 21
What is the age of the eldest son, Thomas ? -12
What is the age of the youngest child? - 9



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How to cross the magical 700 score barrier in the GMAT -1

So you are at your fag end of your preparation. You have just completed a GMAT CAT, you got a score of 640. You also notice that your score has been hovering around 600 to 650. Well you are not alone.

A recent survey states that the average GMAT score is 560, down 10 points when compared to last years average. How is that few people cross 700 whereas the rest of the test aspirants(approximately 2,00,000 out of 2,65,000 GMAT takers) languish in mere 600’s?
Here is my 2 cent

The GMAT score is an indicative of the current aptitude level of an individual. Your aptitude quotient doesn’t improve over night. It takes at-least 3 months of preparation to improve your score. So what is POA right now.

1.Repetition
It is better to work on a question 10 times than working on 10 different questions. Aptitude exams don’t test your knowledge of formula. It tests you on your application of concepts.
Study each problem 10 times, observe the parts a problem
• Variables: elements in the problem which maybe independent, dependent or hidden vis-à-vis other variables.
• Conditions: relationships that relate variables
• Constraints: Conditions that limit the scope of the problem
These parts of the problem indicate the steps and the time taken to solve the problem. This factor results in effective time management.

2. Reason with math
To improve your math preparation, reason with mathematical problems.
For example
What is the product of 5^25 x 2^32?
To solve this sum reason with the problem:
Observe a sample and derive a pattern:
5^1 and 2^1 gives 10
5^2 and 2^2 gives 100 or 10^2
5^3 and 2^3 gives 100 or 10^3
The pattern is one 5 and one 2 gives 10, two 5’s and two 10’s gives 100…. The number of 5’s and the number of 2’s gives the number of 0’s.

Conclusion one 5 and one 2 gives one 10 or a number with one 0.
Hence 5^25 x 2^32 = 5^25 x 2^25 x 2^7
Which is 128 …….(25 times)

3. Do not revise just the formula, learn how to derive it.
Most mathematical problems in the GMAT are related to the method of deriving certain standard formula than the formula itself. For example
While deriving the area of the equilateral triangle = sqrt(3) side^2/4
You will notice that the altitude bisects the triangle into two halves of equal area
The altitude splits the base into two halves of equal length.

4. Compare critical reasoning questions and derive generalization.
Study the CR questions in groups. For example study all “the weaken the argument” questions together. You will observe standard steps every time.
For example you will observe you have
• to first find the conclusion
• then identify the logic( whether its an analogy, a statistical data, a cause effect relationship or an example)
• then choose the option that negates the logic

Simple aint’ it.

5. If you are not strong with sentence correction and reading comprehension till now and if you have only two weeks to go, then there is nothing that can be done. It requires at-least 3 weeks of structured learning.

Use any course ware you have or use the course ware which I have recommended. Its on your right pane. Or if you don’t have the right material mail me ill help….:-)



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