What makes a good school depends on what you're looking for. I agree that ncschoolreportcard.org is a good place to get information about the schools, but there are magnet programs as well as academically gifted programs throughout Forsyth County. There are many options, and you don't necessarily have to live in a certain zip code to go to a specific school the way things are set up at present.
In my personal experience with three children educated in the local public schools, a great teacher is more important than a school with great test scores. If you'd like to chat more about it, please feel free to call me or email. If you're not currently working with an agent, I'd be glad to help you find what you're looking for!