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Quant:

When picking numbers, always try to pick easy numbers for the first go around but stay away from 0, and 1 because they can make even wrong statements right. DON'T forget to try negatives, fractions, and zero.

Use 100 when you see a %

Be careful when reading the stem of questions.If you know the type of number your looking for then you half way there to a correct answer.

Integer= ...-2,-1,0,1,2,...
Non-integer= x/y, where y>x can be either negative or positive
Consecutive= n, n+1, n+2, can be either negative or positive
Positve integer= 1,2,3,.....
Negative integer= .....,-3,-2,-1
Zero is even but neither positive nor negative
Even Prime= 2
Prime= 2,3,5,7.....(there are 25 prime numbers <100)

DON'T forget that moving equations around can help to solve a problem too.

Not all information given in the stems are relevant.
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I just thought of one for the DS questions. If the statment is something like is ax=3-bx?, the answer can be no. It took me quite some time to get out of the mind set of trying to figure out which one of the options would make ax=3-bx (as an example)! Basically, you are trying to figure out if (1) or (2) or neither or both can give you a definite answer, whether it be yes or no.
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Negative signs, getting exponents and multiplication confused, taking more than 3 minutes to answer a question...
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I would like to add:
1. Not taking enough rest before the test day.
2. Taking test in morning - (holds true for some people)
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Spoilt
I would like to add:
1. Not taking enough rest before the test day.
2. Taking test in morning - (holds true for some people)

Unfortunately, where I live (applicable to both the city in which I work, and the city where my family lives), I can't get an appointment any later than 10:30. I think I might actually take this while on vacation back home, as the test center is only a short walk, whereas here I'd have to brave the ever unpredictable emerging market traffic.
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In the Quant section, for problems that deal with Distant/Speed/Time, make sure the units speed matches with distant and time. If the units don't match, be sure to convert it yourself.
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Watchout for "percentage of" and "percentage increase". Those always gets me.
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11MBA
Watchout for "percentage of" and "percentage increase". Those always gets me.

Yes, You are right. I got that a few days ago too. I did all my calculations right. Just chose the wrong answer, so frustrated.
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DS common mistakes that I make ..X is an integer I condsider it x=1/2 ;also when it comes to mean and Standard deviation questions I get so nervous and end up making a mistake.
With RC I get impatient while reading a boring passage I need to improve on this a lot ...
.......................................................................................................................................
The Price of discipline is always less than the pain of regret.
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Thank you for letting me know that I am not alone!!
:-D

giddi77
Another classic mistake in DS is REMEMBERING INFORMATION FROM PREVIOUS STATEMENT and concluding that the answer is B.

I have made this mistake a few times. It is very important that you CONSIDER EACH STATEMENT INDEPENDENTLY
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Why studying 2 weeks of just SC or CR wrong? I thought it will help you to focus.
Thanks.

Praetorian
Its been a while since I took the GMAT, but here is one that I remember..

Statement : x is a positive integer.
I read : x is an integer.


Here are some common strategic errors you can make:

1. I am strong in Quant. Lets focus on Verbal. vice-versa

2. Work two weeks straight on SC, then the next two weeks straight on
CR...so on so forth.

3. I consistently get 75% correct on CR/SC/RC.

4. I must only focus on the difficult problems.

5. Three months is good enough for preparation.

6. I got that question right. I dont care if I guessed. I dont need to
review the explanation or take a second look at it.

7. I know my weaknesses. I dont see any reason to measure my
progress.
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