Q-Bank scores are not directly correlated with USMLE scores.
Q Bank questions are study aides, most of them are not really meant to test what you have just crammed into your brain from 1st aid. What you should gain most from them is a feeling for the timing of the test and its format. Can you get through 50 questions in 60 minutes - can you guess, move on, mark unknowns, come back to them, etc. Also the questions provide you with extra knowledge or pictures to remember and help point out your strengths/weaknesses in subjects.
For you in particular you have to look at whether you got through what you wanted to? Not if your Qbank score is high enough, but did you get through all the review books you wanted to and do enough questions?
If you set up a schedule and got through it what are you gonna do with extra time?
You spent 2 years studying your ass off and you really think an extra week is gonna give you an extra 20 points - doubtful. MAYBE you'll get like 5 more.
No matter what you do you WILL be nervous and insecure before the test and on that day. I was a spastic mess and felt like the world was ending and I was never obsessed with getting a big score.
I hope all you people that need a certain score do well and then you can get that # tattooed to your forehead so every attending knows you by your # and not your name. Not one attending or resident has asked me what my score was, and they could care less.
The Chief Resident during my ER rotation failed Step1.