I've never really been a numbers person. Math has always plagued me and in high school I had a tutor to help me through it.

Problem is that I haven't taken math in about 4 years, so needless to say, it's been a while. I'm trying to prep for my GMAT next month and I'm still doing pretty badly in Math. I have the Princeton Review's book Cracking the GMAT but I'm just doing well at all on it. I'm following the founder's guide on here (or at least trying to) and I want to put in more Math problems. Can someone suggest a book (or a method) that would help me improve my Math score? Powerscore or Manhattan or something along those lines. Thanks!