For those interested in the exam that have not taken yet, you must know that nowadays is still possible to take it for free using a promotion code.
Promo Code: MDOP.
And finally but not less important, the Cleber Marques's Blog, who developed some interesting documents which can be useful as a study material for the exam. The only problem is that they are all in portuguese, but if you speak or at least understand spanish, you can try using them.
There isn't excuses!