thx for all of u amazing suggestion! I appreciate them so much!
And yes, I think one month is not enough for me to have a thorough preparation on CR. I just wanna to do it in a short time! So I can tell it's really tough

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Well, as for math, I just got some points during my preparation, and I'd like to share them with ur guys:
I think the most important point is to be as patient as u can. The Mathematical Theory is not that hard in GMAT. GMAC just wants to test ur ability to solve the Qs in the limited time, so no matter what method u use, be sure u use the fastest one. Reading the Qs very carefully is the basic thing that help u to solve Qs, so do pay attention to this. U know, many Qs are tricky, the ans. would be totally diff. if u miss some points of the information provided.
When I did math, I usually used one method to get the ans., and used another mehtod to test whether my choice was right. I think this is also very useful, at least for me
Hope all I mentioned above make sense to u and wish u good luck!
Yes We Can!!!