Download the test preparation GMAT software at the GMAT site. You need an account, which is free, to get access to the account and download the software. To gain the core knowledge you need for the exam, study consistently the comprehensive math review in the software, which should be able to improve your scores.
Use the downloaded GMAT prep software to practice the questions. Study the answers and explanations for the questions. The software will give you GMAT practice questions and answers. When you take the Quantitative test under the 75-minute time frame, it will give you an understanding of what to expect and the speed at which you need to work to finish the exam on time without any rush. (It helps know how much time to spend on each question so that you are well prepared for the final exam).
Purchase the 2nd edition of "The Official Guide for GMAT Quantitative Review." This guide has approximately 300 questions and answer explanations. The guide is a good source for reviews of algebra, arithmetic and word problems.
Purchase the 12th edition of the "Official Guide for GMAT Review" from which you will be able to practice and get hands-on experience. The guide has reviews and comprehensive answers that are useful for the student who needs lessons but can learn on his or her own.
Access the Admissions Consultants website, which specifically deals with helping and guiding students gain acceptance into high-profile business schools. Make adequate use of the free test and problem-solving questions that are practical enough to help you improve your GMAT score. Taking these tests will ensure you are able to manage the pressure, your time, your strengths and weaknesses so that you know where to channel your efforts to develop yourself more fully before the exam day.
Stop studying for the exam at least a day before the exam as this can take away the nervousness and the stress. If you keep studying until the exam hour, you may be doing yourself more harm than good.