I take some offense to people saying a year is not needed or is too much time. I for one was horrible, and when I say horrible I mean pathetic when it came to quant. I couldn't do the most simple problems when I started studying last March. I remember when my friend gave me his Kaplan book and I looked at the questions and the math reference guide, it looked like ancient Latin to me, I didn't get anything........ I signed up for a PR class hoping they would teach the material, but it is better suited to people who already know the material to an extent and need strategies to beat the exam IMO.
Anyway, to make a long story short, just like any language, math takes time to practice and requires time to become fluent in it. It took me a about a year, but I now know way more than I did when I started. For instance, today I did the second DS practice problems set from powerprep and got 14 out of 20 right (could have had 15 but I did them all in my head. I think thats not too bad, any thoughts?). If I would have done those problems last year, I probably wouldn't have gotten more than 5 right. So if it takes some a year, 2 years, hell even several years to learn the basics, than so be it.