If you have test scores, I assume that you have found the OSPI website? (
http://www.k12.wa.us) Go into the research/reports area. I know that testing scores are not the total definition of a school but their website provides many years worth of data, so you can see how a school has progressed over the years. Skyview high is one of the best in Clark County. As far as testing, the high schools rank CAM Jr./Sr. high (this is a test-into school in Battleground), then Hockinson High and then Skyview, Prairie, Mountain View or Columbia, Evergreen and then Camas.
If you search houses on the RMLS.com website and put in "chinook" as the elementary, that will give you the good middle (Alki) & high school (skyview) that go along with it. Chinook rates 2nd in the county for Reading and 8th in Math. Camas rates 4th for reading & 2nd for math. I've done a comparison of all of the schools in Clark County and also have a huge school boundries map that I made so that I could see where exactly we need to live. :-)
Karol