GMAT August 25th, is it too late to buy additional books?

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I am officially taking the GMAT on August 25th, with a 680 goal. I have a couple of areas I would like to improve on over the next couple of weeks. My last kaplan CAT score was a 590(q38/v30).
What I need to improve on:
Quant: Number Properties, proportions. On both of these topics I am getting <50% of the questions right. I need a slight review of some algebra topics.
Verbal: I need to continue to improve my verbal, up to the 40-45 range if possible. Right now I am struggling with CR and SC. I have read a couple of posts lately stating the Powersource CR Bible is a great book for CR questions.

WHAT I HAVE:
OG11 (BY Friday August 9th I should be have half of the questions finished)
Kaplan Course and All Online Material
Kaplan 800

Thinking about ordering:
Powerscore CR Bible?
Older OGs? Were can I order these from?


Should I consider picking up new material? I still have a lot of the kaplan material available online. I have completed most of the required material and part of the optional material.

Thanks
Source: — GMAT Strategy |