290 if you get a test that, regardless of the questions rankings of 'easy', 'medium', or 'hard', that asks you 7 blocks of 48 questions on material you covered really well.
0 if you get a test that, regardless of the questions rankings of 'easy', 'medium', or 'hard', that ask you 7 blocks of 48 questions on material you don't know much on.
Joking aside, this bad boy is a huge crapshoot - though it looks like you are doing well in your preparations. I can't predict you a score, but I'd try and get my UWorld closer to 60% and if it is a second time through, accept no less than 75% (on the second pass itself).