Prolonging (step 1) agony

After doing very poorly on 2 practice tests taken over the past 3 days,  I'm beginning to think that there is no way I'll be ready to (re)take this exam a week from today.  I don't understand why my score is beginning to trend steeply downwards instead of maintaining stable or continuing to climb?!  I just want to be done with this all and back on the wards, back to what I came to medical school for in the first place; yet I also can't afford to fail again.