Hi ljjuaerz,
Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
1) How many months ago did you take that practice CAT/mock? Was that the only one you took or did you take any others?
2) Did you do any GMAT studying around that time (and if so, then what study materials did you work with?)?
3) What is the application deadline for the Program that you're interested in?
Raising a 430 to the point that you could consistently score 700+ will likely require at least another 3 months of consistent, guided study - and you'll have to make significant improvements to how you handle BOTH the Quant and Verbal sections. From what you describe, you will likely need to commit to more than 8 hours a week of study time though (or you might need to plan for a longer study timeframe). Thankfully, the GMAT is a consistent, predictable Exam, so you CAN train to score at a higher level.
For free math practice and help, I recommend that you set up an account at Khan Academy (
www.khanacademy.org). The site is completely free and makes the learning a bit more fun and 'game-like' (as opposed to the dry academic approach taken by most books). While the site is vast, you should limit your studies to basic Arithmetic, Algebra and Geometry. After spending a little time re-building those skills, you can start your GMAT studies.
GMAT assassins aren't born, they're made,
Rich