Ok, I will throw this one out as a point of discussion.
Let's say you used a brain dump but that allowed you to direct your studying resources to what was actually going to be on the test, instead of spending hours studying irrelevant material?
Let's say this braindump showed your areas of weakness and drove you to explore further these topics more in depth until you mastered them?
Let's say that at the end of the day, the brain dump helped you master the topics on the test. You set up your own simulation labs and test labs at home and used other studying resources. You didn't just memorize the material, you absorbed them, you applied them in your own applications.
Personally I don't think there is anything wrong with using braindumps as long as you know the material and you can apply it later, if it translates from short-term memory to long-term application.
I once had an anthropology class in college. It was a class near the Thanksgiving holiday and few attended it. The professor surprised us at the end of the lecture by saying "every one of the questions on your next exam was included in this lecture". This, in essense, was a brain dump!
But the whole point I was trying to make is, as long as you "know" the material, who cares if you use a brain dump or not? The point is, know the material and apply it.
Anyway, this is my opinion.
The wisest people are those who are smart enough to realize they don't know it all.