Firstly, if it is not a problem, I would recommend rescheduling the exam.
Secondly, Stay focused on what you from the exam, how much score you are targeting, is you verbal and quant prep up to the mark for the score you want? Maybe once you have these answers you can book an exam date.
Thirdly, if you want to give the exam next week, don't stress out. Prepare you best.
Pick up topics you really like and you think you can make a drastic improvement within a week. Work on your weaknesses.
It is just an exam, which you can always give again with better preparation.
On the exam day, take a Chill pill and perform your best.
All the best.
PS -- Even I am aiming for a Canadian MBA college for next year August Will write my exam in October last week.