Hi. For those of you looking for completely free, high quality, computer adaptive material for the GMAT quant, try chiprime.com
Each quiz is 5 questions to be completed in 5 mins or less, and you get a percentile when you finish, that compare you to other test takers.
Please remember to like us on Facebook when you use it.
We built this because we were tired of the lack of good quality computer-adaptive material for GMAT prep when we studied for the test.
Several hundred questions already posted, new ones added weekly or so, and complete lesson plans coming soon. All completely free.
Good luck with the exam!