I am preparing for GMAT to apply for a part-time MBA in Canada.

I have my GMAT end of this sat. In the tests that i wrote so far, timing is not a problem. I spend little more time in the beginning and at the end i get easier questions as the CAT identifies my level perfectly when i am close to 30th question.

Official GMAT 530 (Q40, V23) - Sep 2010
Prepared with only Kaplan premier online - No OG guides were used

In Nov, i purchased OG guides and MGMAT study guides. Prepared with these guides. My current preparation status is below (CAT with essays):-

MGMAT - CAT 1 29-Dec-10 590 (Q46, V24)
MGMAT - CAT 2 31-Dec-10 630 (Q44, V32)
MGMAT - CAT 3 2-Jan-10 580 (Q44, V26)
MGMAT - CAT 4 8-Jan-10 590 (Q42, V31)
MGMAT - CAT 5 15-Jan-10 640 (Q45, V33)
GMAT Prep CAT 16-Jan-10 640 (Q45, V33)

Official GMAT 22-Jan-10 Aiming 660

Identified my weak-areas as
a) Variables in the expressions(VICs - wrong everytime)
b) Reading Comprehension (75% wrong)
c) Critical reasoning (25% wrong)

I am reading articles in BeatTheGMAT forums and working on the three weak areas this week.
Any last minute tips to improve my accuracy is appreciated.

I plan to write one more CAT from MGMAT on 20-Jan-10 to ensure consistency.