I have a completely different experience. When I first started wiki test prep I was averaging 70-75%
recently it's been easy to hit 80-85% equating to a 230-240 estimate.
On the other hand, I've been having difficulty hitting 230 on any other form of practice test.
I find the wikitestprep SIGNIFICANTLY easier than UWorld. Not tryin to gloat because I suck at everything else!