Is your score inline with your GMATPREP scores?
There are many positive experiences shared in this site.
So its not impossible. You have a enviable quant score - some more verbal is required..Buck Up!!
I gave two GMATPreps - one halfway through my prep and another just couple of days before.
In frist I got, 680 - Q50 V31
and in the second one I got 700 - Q49 V35
I am just scared because at the earliest I can give the exam in August first week and then less time would be left for Round 1 applications.
Honestly speaking I am not disappointed with the 680 score but the extremely low 28 verbal score.