USMLE Rx score prediction

Is the USMLERx score predictor even remotely accurate? I've been doing a block per day (25 qs in the morning, 25 in the evening) for a month and a half now (maybe a couple days breaks in there sometimes) and it has my
Predicted USMLE Performance 248 ( +/-20 for the 95% CI).

Which I am having a very hard time believing. But there is also this from the USMLERx company on its accuracy as well: http://ift.tt/1OTU0CF

I could believe I am probably somewhere over 220, but I highly, highly doubt it is anywhere near 248 lol.

Still just wanted to get people's experience with it and whether or not it was in any way predictive.

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USMLE Rx score prediction