Hi mtk10,
Unfortunately, there's no "guaranteed way" to train to score 700+. That score is approximately the 90th percentile, meaning that 90% of Test Takers will never score that high on the Official GMAT, regardless of how long they study or the number of times they take the Exam. Over the last month, you've seemed focused on finding the "right" practice questions, but what you really need is proper training material and guidance - so that you can learn all of the Tactics, patterns and little 'secrets' to the GMAT. Working through lots of practice questions isn't the most effective way to gain all of that knowledge, so you might want to consider adjusting how you're approaching this process.
Before I can offer you and additional advice, 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 take the GMAT?
5) When are you planning to apply to Business School?
6) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich