*Be aware of the relative weight the GMAT exam places on topics. Topics such as number properties and algebra come up again and again-master these topics before spending time on less commonly tested areas such as probability.
*Train yourself to avoid unnecessary calculations, particularly on Data Sufficiency problems. Remember that it is enough to know that a solution can be derived, whether or not you know the actual solution.
*Take a 30-question quiz on each topic – Number Properties, Algebra, Word Problems, Coordinate Plane Geometry, Probability.
*Identify whether you need to work on your concept building or Improving the process to solve questions. If you score less than 60% on a topic, you will have to work on your conceptual gaps. Therefore, you need to revisit the various concepts & formulas and then learn how to solve questions using these concepts by practicing 15-20 questions. If you score between 60-85% on a topic, you will need to work on correctly applying the numerous concepts you have acquired. Learn how to solve them systematically, and then practice 10-15 questions to solidify your learning.
It is important that you do these topics in the order mentioned below because topics in Quant are inter-dependent and hence it is important to follow this order.
Here are a few points that will help you approach data sufficiency questions better:
Write out all the important information in the question stem, whether it be certain constraints (integer, pos/neg etc.), equations, or the actual question. This helps avoid silly mistakes.
*Always break down and rephrase any equations, inequalities, fractions etc. For example, try to write expressions with exponents so that all the bases are the same, or whenever you see a sum with a root contained in it, try to multiply by its conjugate.
*Always translate word problems into an algebraic equation. There will most likely be an opportunity to break this equation down further and rephrase the question. This skill is key as it saves time in computing the two statements.
*Never try to prove a statement to be sufficient. Always try to prove insufficiency. Never make assumptions. On most questions where there aren’t any constraints given, people sometimes still assume some constraints and thus only test integer cases. By paying attention to what is given and what is NOT given, you can find the correct answer on a lot of questions.
*Never eliminate a statement just because you "feel" the statement is insufficient. Especially with quadratic expressions, people assume the data is insufficient since they can’t find a single solution. This is a big mistake. Always finish your calculation, because you don’t want to spend a lot of time on a question and end up being wrong just because you skipped the last step(s) of the calculation.