S.B.
D. - all school districts will have a website - that website will give you the statistics for each school - demographics, teacher/student ratios, test scores, etc. They will also link to the school's individual website (if they have one) - then you can begin getting a "feel" for each school. You can do all of this ahead of time for the different areas you're looking at, so when you do show up, you have a lot of information behind you to help you make a better decision.
The responses so far have told you to get with your Realtor - that's an excellent resource! Just make sure your realtor is interested in serving the entire area of where you are moving to and not just parts of it (like here in the Metroplex - realtors tend to beocme experts in particular areas instead of the entire metroplex due to size).
You can quickly find out school districts and info at www.localschooldirectory.com - you just need a zip code or a city to find them all.
Good luck with your move!
S.