Hi pun91,
Based on what you have described, you are not likely to score 710+ in 9 days, so you should pay the $50 fee and push back your Test Date. Assuming that these practice CAT results are accurate, you will likely need at least another 1-2 months of consistent, guided study to hit your score goal. Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied?
2) What study materials have you used so far?
3) How have you scored on each of your CATs (including the Quant and Verbal Scaled Scores for each)?
Goals:
4) When are you planning to apply to Business School?
5) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich