You and I got similar scores and we have similar aims so if i were in your shoes this is what I'd do:
Quant
Make sure you have the fundamentals down cold... i.e. number properties (divisibility, primes, odds, evens, positives, negatives, consecutive integers, absolute values, roots, exponents etc..); equations and inequalities; fractions, decimals, percents, ratios; geometry; rates & work; algebraic translations (i.e. translating words into algebra). You can't afford to not know how to handle these types of questions coz they are fundamental.
Then make a list of all the common GMAT traps e.g. when square root questions have a +ve AND -ve value and when they only have a +ve value. For instance, if x^2 = 25, then x can be +5 or -5. But √25 can ONLY be +5. Everyone should know this but believeme when it is part of an equation in a DS question you can easily forget. You can go on the internt or search this forum but make a list of common traps and stare at it everyday from now till G-day.
Verbal
The easiest thing to imporve on in a week is SC and Manhattan GMAT SC is the bible. If you don't have it it might be worth it to get it fedexed to you. This week make sure you KNOW cold all the things the GMAT tests in SC... there's less than 10 of them e.g. parallelism, subject verb agreement, pronoun agreement, modifiers, verb tense etc...). Make sure you can recognize and articulate exactly when one of these is being tested i.e. write down "they are testing placement of modifiers, pronouns agreement, and parallelism". If you do this you will begin to see patterns in how they write SC problems. When you start toi do this SC becomes a lot easier and it is shocking how fast you can improve on this. If you are a native speaker DON'T rely on your ear... rely on the rules. Remember, for scores in the low to mid 40s improving 2 points in the verbal has a bigger impact on your overall score than improving 2 mpoint in quant so don ignore verbal.
General
Focus on making the fundamentals flawless and if your fundamentals are already flawless and you happen to know more stuff, consolidate what you already know. Don't try learn new stuff. If you are scoring 710/720, then your main concern should be "don't get 650 level questions wrong rather than how do I get 780 level questions right." If you get a couple 780's wrong, you're at what, 760? If you get two 650s and then a 640 wrong it'll be tough to bounce back to 720. So that's why you need to focus on making your fundamentals flawless so you don't miss 650 questions and on consolidating what you already know beyond the fundamentals so that you don't miss 720 questions. If you aim for 720 then you are OK to be getting 750 level questions wrong....but you are not OK to be getting 650 level questions wrong.
If your G-day is next Thursday, then the latest I would do another full blown Prep would be this Friday coz that's about how much time you'll need to really learn from the test and if you bomb the test this Friday you'll have time for your confidence to recover. It may be better to do single sections and really take them apart. Another thing you could do is try to get your timing even better than it already is by doing sets of 5 questions, then 10 questions and seeing if your internal clock is accurate coz you don't want to be clock-watching when you could be calculating.
But in general you should be thinking "focus on fundamentals and consolidate what I know, focus on fundamentals and consolidate what I know, focus on fundamentals and consolidate what I know..."
Good luck!
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