I took that BrainBench certification exam as well. I must say that it's got some difficult questions. No, of course it doesn't test your skills usefully -- that would take a sample program -- but it covers a fair spread of data. I got a 3.72 out of a possible 5 (4 being 'master level') with my weak point identified as modules. I have decided to start hacking on the Net::ICQ module to improve my skills in this area.