You don't say what you're going back to school for or what you plan on taking when you get there, so my answer might be a bit different with that information. B

You don't say what you're going back to school for or what you plan on taking when you get there, so my answer might be a bit different with that information. But even if you didn't pay all that much attention the first time, it won't take you a year or two to brush up on high school math. You should be fine with a month of nights and weekends with a problem book. You'll probably want to get something like a Precalculus Problem Solver or Schaum's Outline and just do all of the exercises, or look for a textbook with full solutions. Give each problem a good try, don't beat yourself up if you don't come up with the answer, but make sure you understand the solution. You could probably ask on the forums on the Art of Problem Solving if you're really stumped. Good luck!