In addition to the free GMATPrep Test Preparation software, GMAC now offered 2 more new tools for you to prepare for the test.
GMAT Focus ™ Online Quantitative Diagonistic Tool
Using real, retired, GMAT questions, the GMAT Focus™ diagnostic evaluates your performance in critical testing categories, provides you with a highly accurate score, and ranks you in relation to previous GMAT examinees.
GMAT Write ™
This web-based essay writing practice tool offers you real GMAT writing prompts along with feedback on how well your essays demonstrate your ability to think critically and communicate ideas. Each practice essay will be scored in real time with the same automated essay-scoring engine used by the official GMAT exam.
You need to purchase the access rights.