Download the GMATPrep test-preparation software at the GMAC website (See References). You must register a free account with the website to download the free software. Study the comprehensive math review in the software to gain the core knowledge necessary to improve your GMAT Quant score.
Use the GMATPrep software to do the GMAT Quant practice questions. Study the detailed answer explanations for the questions. It also has two complete computer-adaptive GMAT practice tests and answers. Taking the Quantitative Section under the 75-minute time limit of the real test will give you practice on adjusting your test-taking speed to answer all questions within the time limit. You can often improve your Quantitative Section score by simply learning how much time you can spend on each question.
Purchase "The Official Guide for GMAT Quantitative Review, 2nd Edition" (See References). This official GMAC study guide for the quantitative portion of the GMAT has 300 questions and answer explanations. According to GMAC, the guide will help you improve through reviews of arithmetic, algebra and word problems. As of 2010, the cost is $17.95 plus $4.95 for shipping. You may order online by credit card or PayPal.
Purchase "The Official Guide for GMAT Review, 12th Edition" for more practice (See References). This GMAC guide has questions and comprehensive reviews for all portions of the test, including a different set of practice items than the individual quantitative review guide. The guide also has an additional diagnostic test. As of 2010, the cost is $36.95 plus $4.95 for shipping. You may also buy this guide online by credit card or PayPal.
Access the AdmissionsConsultants "GMAT Problem Solving" page (See References). AdmissionsConsultants specializes in helping students gain acceptance to top business schools. Use the free test-taking strategies and problem-solving practice questions to help improve your GMAT Quant score. You may also access "The Data Sufficiency Section" page for tips and practice questions to improve on the data-sufficiency questions on the GMAT Quantitative Section (See References).