Nope. Only best guesses. But the discussions surrounding the questions are pretty good.
The best way to approach questions isn't, "What's the right answer"? It's, "What should I have studied to answer a question like this correctly"? Then you go study those things.
Repeat questions are very rare. Repeat concepts are much more common.
As an example, I had two questions on the real deal that seemed very similar to the sample questions. But I also had around 10 concepts that came those sample questions.
Worth doing, in my opinion.