I need help with a lot math but learn best when I study a single concept and then practice that same concept multiple times (at least ten times) before moving n to the next concept... Is there any book or prep material out there that presents information this way?

I have Kaplan and Princeton guides but they both present one concept and then one example. After 10 concepts there are some practice questions but its harder for me to understand the concepts that way. Any suggestions?

Oh yeah, I thought I was smart and got a 480 on my GMAT last week.