Do you think you focussed on the initial questions more than the questions in the latter part of the test.
focus on every question as much as you can and know when to move on.
I took a GMAT Prep today... I got #2 and #3 wrong (#2 was a really basic mistake) all in all i believe i got 11 (or maybe 13) wrong in Quant. still scored a 46 in Q!. in Verbal I did not get any question wrong until #13. I got a total of 7 wrong. I got a 45 in V for a total score of 730.
my point is -- don't try to figure out the algorithim...!! just attack every questoin as best u can