I used to be an AdWords Certified Professional or AdWords Qualified Individual or whatever it’s called. I took the test three times and passed easily. But I won’t be taking it again.
The first reason was one of timing. I last took the test in 2009, and it was supposed to be good for two years. Then in 2010, Google announced that they were completely overhauling the testing procedure, and everyone had to take it again. (They even provided vouchers to cover the cost) But I didn’t have time to mess with that; I had three clients doing major site overhauls in the last half of 2010, and when I took my last test, it was supposed to be good for two years. No reason at all Google couldn’t just say the NEXT time we were due for tests, you have to take the new ones and be done with it. So that reason was just plain stubbornness on my part.