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if you haven’t already heard of it, PXL designs has released Attest 1.5 which is a tool built in adobe AIR that provides mock tests for Flex 3. Unlike Attest 1.0 which was not free, this is a free version which provides 3 full length tests of 50 questions each and 5 mini tests of 25 questions each. It also shows section wise scores, provide livedocs links for that particular question.
One minor drawback is that you must have internet connection as it loads tests and questions from the net everytime…this is also an advantage as you’ll get updated questions.
You can download Attest from here:
http://software.pxldesigns.com/attest/index.php?id=download
Even if you are not attempting the test, it’s fun to attempt to these tests just to check the level of your knowledge and how well are you aware of your flex basics….happy FLEXing 
I have used this attest software more than 3 months. yesterday I have taken the exam and failed. Not a single question come from this software. I thing, I have wasted my time. My experience with this software was very-very bad. It was too much frustrating for me. I will not recommend this software to anyone. Please don’t use!!!!!!