Check out
2007 Maryland Report Card
Elementary schools in Perry Hall/Nottingham are OK at best, but the better ones are overcrowded and they are in the process of building new schools.
Make sure your kids feed into either Gunpowder, or if you can find a place that feeds into Jacksonville elementary, that's your best bet. Gunpowder is pretty good and Jacksonville is one of the best.
Not the best or the worst is Chapel Hill, but make sure they absolutely will not be attending the new Vincent Farms, or Shady Spring.