You want to check if you are certifiable or just test your Windows skills ? Try the Are You Certifiable game here with music, lights and three life lines (A la Who Wants To Be Millionaire) dubbed second-shot, technet and hyper-v. If you register you unlock more questions (5 seasons, 20 episodes) and can save your score and come back to it later. I tried this unregistered and the game still had a lot of questions to answer and some of them were quite challenging. Answers are explained and your score gets tallied up against other players. Of course the questions are biased towards IT professionals but I would say this stuff is relevant for programmers (that wish to know everything that is going on in Windows). You cannot architect enterprise software or understand Windows security without knowing Windows from IT perspective.