GMAT test Problem Help needed URGENTLY

hello all,
Hope people are doing great.Well I wanted to discuss one problem of mine,regarding GMAT.Its about my scores in the tests that I have taken till now.Its pathetic as even in Princeton,in the first two tests I have got between 500 and 570.The problem is I am unable to keep the accuracy that I have in general under timed conditions.I have been preparing from August 2009 and I am almost done with OG 10,11 and 12 with decent accuracy in the verbal section of 90-95% in CR,85-90% in RC and 80-85% in SC especially.Maths section is pretty fine with me and I am doing the Quant tests from GMAT club to improvise.I am now doing the GMATprep,MGMAT questions from the forums and my accuracy is pretty good.

In the Quant section I get 28-30 questions correct out of 37 with 2-3 question missing due to silly mistakes.But in Verbal,its 24-28 questions out of 41,with timing not so good.To juggle between time and accuracy I am facing problem.Till now I have taken around 12 tests from 800.com,Kaplan and now Princeton.My correct number of questions are almost the same in all.I am due for my exam in the month of December and I haven't even reached the score of at least a 600 in any of the tests till date,which is bothering me.

I am preparing on my own right now.But for the problem that I am facing I need some help.

So please let me know,what you can add upon.

Thanks and take care.