Hello Vicky--Unfortunately for us DC peeps, the road to the CCIE isn't very well plowed. I had a very hard time looking for dummy questions to test my preparedness. The one thing that I did do, however, was make a flashcard deck for the written exam for every dummy question I came across, plus a bunch more. I made it for the v2.0, so there's some material in there that is no longer tested, and some material new for v2.1 that isn't there. But one of my online colleagues just passed the v2.1 written using my deck, among other resources.
I am happy to share. It's https://quizlet.com/230858801/big-pile-of-data-center-flash-cards/ You can also download the Quizlet app to your smartphone or tablet to take it with you.
I'll be putting up my flashcards for the lab exam shortly.