There's few info about the exam, and some people said it's difficult. My point is that the test is not that difficult. The only problem is that it covers a very broad area of technologies, so that it takes time to prepare. However, I did not find any expert-level questions, only beginner to intermediate
I prepared with RMH book, blueprints and MZ's guide. They cover the most part of the test questions. Mikalai, thanks for your guide
There were some drag-n-drop questions I had never met before. The problem with them is that you cannot open and check you answer - when opening the question, the answer is reset.
They give you 2.5 hours - enough time to answer, check it and have a cup of coffee.