GMAT Strategy

Hello...

I will be taking my final GMAT in 10 days on the 19th and I took GMAC GMATPrep exam today. ...following is the history of my performance till now..

Kaplan Diagnostic - 570 (Q-64%, V-56%)
Kaplan CAT1-640 (Q- 88%, V, 33%)
Kaplan CAT2-650 (Q- 79%, V, 53%)
Kaplan CAT3-650 (Q- 79%, V, 56%)
Kaplan CAT4-670 (Q- 88%, V, 56%)
Kaplan CAT5-690 (Q- 99%, V, 43%)
Kaplan CAT6-620 (Q- 63%, V, 56%)
Kaplan CAT7-660 (Q- 84%, V, 56%)
Kaplan CAT8-600 (Q- 79%, V, 53%)
GMAT Prep - 580 (Q-Raw score 18 Wrong out of 37, Verbal -18 wrong)

I will be taking the Kaplan Ultimate Practice test in 3 days and my final GMAT in 10 days.

Need a morale boost and secondly considering 10 days left what's the best I can do at least to fall around 650. I am very sure I am capable of scoring around that range but the past 3 exam scores don't seem indicative of that.

I want to get a good score in the Ultimate practice test and finally in the final exam...hopefully the ultimate kaplan test will be a morale booster...

any thoughts on how difficult will the ultimate test be? and how indicative is the score when compared to the final GMAT exam?
Help will be greatly appreciated.