Practice more! you have shown good improvement, but really 10 weeks is not that long considering your level. You probably have 1 more shot before schools start to question the number of times you have taken the exam. I am a big fan of the GMAT Prepster Quant Guide (Obviously) and it now comes with step by step answer explanations for the OG 13
and QR 2 to help you figure out your weaknesses. Happy to show you an example or two if you are interested.
If my response helps, please add throw me a kudos.
Jim Kernan is the Director of GMAT Operations at Stratus Prep and author of GMAT Materials for GMAT Prepster.