GMAT Strategy

Hi Everyone!

I began a vertias prep 6 week course about 2 months ago. Since the class started and up to this point I have taken 4 practice exams ...I refuse to take the actual exam until I can break 600 on a practice test. I'm starting to get really down on myself and think this just isn't for me. As much as my verbal score keeps improving (started at 25 now at 33), my quant score is sinking each time (started at 25 now at 18!!!). I'm starting to think I should really focus 80% of my efforts on the quant, as it seems the Verbal comes easier to me each time I practice and go through the motions...

I'm thinking of just stocking up on some math refresher books and doing all the practice problems I can physically and mentally handle. I work 9 to 10 hour days and find it very difficult to study during the week. I know that this is working against me. I can't expect to succeed in anything that I'm only able to offer 10-12 hours each weekend to. I need to constantly be using the parts of my brain for these quant problems until they are drilled in there and have no way to escape. I'm not "bad" at math, I just really haven't used it in about 7 or 8 years. My job is comprised of excel worksheet formulas and I have a calculator handy. Exponents and roots? Yeah, I haven't seen those since High School. I took one statistics course in College and got by with a B+. Honestly, my math skills needs a touch up, and I have no problem admitting that.

I don't want to give up on taking the GMAT. I find myself thinking I can do just University of Phoenix online because they don't even require a GMAT, but that's NOT what I want. I do not want an MBA to just say I have one. I want to hone in on my skills and talents and learn about what it takes to be successful and a driving force in the areas that I'm interested in. Fortunately, I'm not looking to go into finance or accounting (sigh of relief), but I know how important quant skills are, not just for this test, but for business in general.

First practice score at 540 (week 1 of the class, no studying, no strategy, etc.)
Second: 490
Third: 540
Fourth: 510 (end of the veritas prep course)

I'm considering perhaps re-taking the prep course after I have been able to bring that math score up, just to refresh myself on the strategies and how to go about tackling each question. My basic math skills are up to par, but I'm having a real hard time with the more complex concepts that the gmat puts together and throws my way.
Any advice would be greatly appreciated.
I plan to sign up for the 60 day BTG daily math that is offered on the site. I'm eager to attack the test full force and really just want a 100 pt. increase in my initial score, which I believe is very reasonable and do-able. I would love to hit 650 to 700 but I would really be thrilled with a 640 and can then push on further. It's SO discouraging to not break my first score after having spent the time on money on the course in addition to studying ...
I've concluded that I do need to STUDY MORE, but again, the lack of score increase is really messing with me