I think PowerPrep reflect likely exact our ability. The score I got from PowerPrep was not very different to one I got in the actual test. Good luck to you!
"They say that in the same week everyone gets the same speaking and writing questions. ı am wondering if its right or not.where are you gonna take the exam?"
@Boselecta: I haven't heard about this information. Would you mind give me the exact source of that announcement?
I hope ETS will response soon like the case of my friend. He encountered some unknown problems, ETS announced that they couldn't find his score, and they give him another test (free of course). Good luck next time!
I agree that GRE is not everything, once you have a trong research background. You should choose universities in diverse rank (some upper universities, some mediate and some low ones)