With one month left until the GMAT's, the math is really what I need to spend most of my time on. Just wondering anyone's opinion on the best book that will help me for one month of studying quant. I have the official GMAT quant book, and a princeton math workbook. Just wondering if anyone knows of anything more helpful? My most recent quant score is a 30, so I really need to get it up! Any ideas would be very much appreciated! Thanks 
