GRE practice test that accurately predicts your score?

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I couple days ago I took a magoosh practice test and scored an equivalent of a 690 quant and 630 verbal. I took the first powerprep test today and got an equivalent of a 730 on quant and a 530 on verbal. There seems like there is a huge discrepancy on the verbal scores and I would really like to have a rough estimate of where I stand before I take the real thing. Does anyone have any suggestions for what might be a good practice test to take that might be a good prediction of my actual scores?
Thanks!

The powerprep tests are the most accurate because they use the actual GRE scoring algorithm.

My practice tests were not very accurate. I took multiple Kaplan and powerprep tests and my scores were all over the place (for the old GRE). I couldn't get my math score above the mid 600s on the practice tests but I scored in the upper 700s on the real thing. I still remember the feeling of absolute shock when the scores popped up on the screen. I actually asked the proctor if they were real.

My last math question was finding the area of a square so naturally I freaked out and thought I failed the whole thing.

I think practice tests are great but I have no idea how to assess their accuracy.