Let us focus on the Tactical aspects of the GMAT.
You don't need to know a hundred different formulas to score a 45+ on the quantitative section!
Contrary to popular belief, the GMAT Quant section can be a walk in the park, if you know the answers to the following relevant yet simple questions:
1. What is the total sum of angles:
a. Inside a Circle
b. Inside a Triangle
c. On a straight line
d. Within a quadrilateral
2. How many equations do you need to solve:
a. If there are 3 variables
b. If there are 2 variables
c. If there is one variable
d. How do I plugin numbers into equations to obtain solution(s)?
3. When answering questions related to probability, why should I only need to find out the value of the denominator? How do I find out the value of the denominator anyways?
4. What is a prime number, whole number, rational number and irrational number? Is 0 a prime number? Is 1 a prime number? Which is the smallest prime number?
5. How do I represent a problem on a number line? How can I use this to solve problems related to range, statistics, fractions, etc.?
If you have answers to these 5 questions, you can solve 75% of the problem solving questions on GMAT quant and most of the tough DS questions.
Am I going to give you the answers? Well, not yet... if I do, you'll never really remember the answers would you? I will be posting explanations soon, but till then, I invite you to find answers to these questions yourself (IF you're really serious about grasping the concept).
You can answer these questions within the first 5 minutes if you google the info, but what is more important is that you retain these concepts and know how to apply them on the GMAT.
For example, the internal angel of a circle is 360 degrees, while the sum of the angles formed on a straight line is always 180 degrees. So, if you get a question in which a triangle is inserted into the circle, with one side of the triangle being equal to the length of the diameter and the question relates to angles, well, you know everything there is to know.
The point is, you should know as many shortcuts and formulae as you can. But, if you understand the concept behind the formula and you can still get to the solution. For example, there is a very handy formula that helps you solve questions such as, "If A can get the job done in 10 minutes and B can get the job done in 15, how fast can they get the job done together?"
But all you really need to know is that the rates(1/10 and 1/15 in the above problem) are additive and you can solve the problem without some formula burdening your mind!
So understand the 5 points above and make sure your approach to the quant section is based on concepts instead of in formulae that you may or may be able to recall on test day!
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