Get Your Basics Sorted - The GMAT assumes that you understand certain concepts and use them as the basis of reasoning to solve the Quant questions.
Learn to Use Numbers Effectively - In GMAT Quant, the difference between the guy scoring 45 and the one scoring 51 is NOT that the latter knows more formula.
Do Not Jump to Conclusions - make it a point to notice the mistakes you make on practice tests so that you’re careful not to make them again.
Identify Simple Solution - When preparing for the GMAT quant section, you must learn to think like a test-maker.
Use Logic Over Math (Especially on Hard Questions) - One of the themes we always stress is that the GMAT Quant section is not, primarily, a math test.
Do Not Depend Only on the OG - The best workaround in this situation is to review the questions on GMATClub and take notes about alternate approaches used to solve the question.
Never be Rigid with Techniques - The whole point of reviewing questions using GMAT Club or the CrackVerbal forum is to bring to light new techniques that can help you solve questions faster.
Master Data Sufficiency - Data Sufficiency questions generally make up just under half of the questions in GMAT quant. Since there are 31 questions in the Quant section, about 14/15 of them will be data sufficiency questions.