What would have been the result if...?

Hello. I just took the GMAT. The result was 650 (Q39 V41). I am very disappointed that the score was percentile 50 in one section and percentile 92 in the other.
The problem was that because of the supervisors fault, I started my Q section 2 minutes late and after a nasty quarrel with one supervisor who didn't want to log me in. I am very upset now, but I will probably share my experience later with details of the test-center and what happened.
The purpose of this message is only to ask what wold have been the final result if I had scored Q45 (which was what I expected before the exam according to GMATPrep Nº2) instead of Q39.
I already sent a complaint to the GMAC in order to take the test again, but I would like to know if scoring 6 points less than expected in the Q section makes a big difference in the total.