Part 1: Free Online GMAT Practice Tests

1. The best GMAT practice tests tool is GMATPrep software. It can be downloaded via this link http://www.mba.com/mba/thegmat/downloadfreetestpreparationsoftware/
2. The GMAT Quantitative Section Simulation Test provided by GMAT MBA Prep. It simulates real GMAT test (the quantitative part) and has 37 questions. Answers, stats and some explanations are also provided.
3. The GMAT Verbal Section Simulation Test provided by GMAT MBA Prep simulates real GMAT test (the verbal part) and has 41 questions including sentence correction, comprehensive reading and critical reasoning. Answers, stats and some explanations are also provided.

Part 2: Online GMAT Test-taker Commnunities, Forums and Discussion Groups

1. GMAT Club
   GMAT Club is an interactive community that provides up-to-date information on the Business School Application Process. Open since 2002 and with over 70,000 members, the FORUMS cover GMAT strategies, CAT tests, the MBA application, and even offer free Profile reviews.
2. Chase Dream (In Simplified Chinese)
   If you understands Chinese Chase Dream is a must-go. Thanks to flexible copyright laws it provides the richest, downloadable and yet free resources. For example, you can find the Official Guide for GMAT Review 12th Edition by playing a little trick. What’s more, the community members are willing to share details of real GMAT test questions right after they leave the test site.
3. Beat the GMAT
   There are some active experts at Beat the GMAT so surely you can get answer(s) for any of your GMAT question.