You can find a lot of information online about the GMAT. I will only write what I thought it was important. Although most of the information required for the math part is basic, I was surprised to notice that time passed and my knowledge about math was fuzzy sometimes and I also need it an update of the English equivalents of the terms used.

Integers = negative or positive numbers. Do not include fractions.
= odd or even.

a=b x q + r (q=quotient r=remainder)
Distinct numbers = cannot be equal
Prime numbers = a positive integer that has exactly 2 different positive divisor (1 and itself). 0 and 1 are not prime numbers
Absolute value of 5 is |5|

Divisibility rules:

• 6 is divisible by 2
• the factors of 20 are 1,2,4,5,10
• 20 is a multiple of 4

Remember:
Most problems at GMAT require more than one step in getting the right answer!
If you are not a native English speaker learn the technical terms!

Read More

On data sufficiency GMAT problems all the drawings are useless in solving the problem. Also remember TIME is of the essence. If you written down more than three rows of formulas for any GMAT problem … STOP … click on any answer and move on. The closer you think you are to the answer, the more time you loose!

If a question asks “what is x?” it means: can a single value for x be found?

For data sufficiency GMAT problems, when see the word “percent” think part/whole

For a data sufficiency statement to be sufficient there must be as many equations as there are variables.

• A single equation with two variables cannot be solved
• Two distinct equations with the same two variables can be solved, using simultaneous equations

Just because there is only one variable does not mean an equation has just one solution.

• An equation with a variable raised to an even power may have more than one solution
• An equation with a variable raised to an odd power will have only one solution

Data sufficiency yes or no: if a statement answers the question in the affirmative or in the negative, it is sufficient.

The answer can be no!!!

Never assume!!!

Just because one statement seems to agree with the other does not mean they are necessarily saying the same thing. !!!

When you look at Statement 2 always cover up Statement 1 and think like you never saw it. !!!

The essays for GMAT are 30 minutes each.

What you need to remember is:

• Nobody cares what your opinion really is
• Be superficial

Tips & tricks:

• When an entire paragraph contradicts with another use expressions like: on the one hand/on the other hand, the traditional view/the new view.
• When you support the main idea use: for example, to illustrate, for instance, because.
• When you use a second argument to support the main idea: furthermore, in addition, similarly, just as, also, moreover.
• The most important idea that you write must be introduced by one of the following words: surely, truly, undoubtedly, clearly, certainly, indeed, as a matter of fact, in fact, most important.
• The conclusion starts with: therefore, in summary, consequently, hence, in conclusion, in short.
• When you talk about the opinion that you argue against, start with: admittedly, certainly, obviously, undoubtedly, one cannot deny that, true, granted, of course, to be sure, it could be argued that.