Gotta love one public school comparing itself against another.
The California testing data is still excellent.
If anyone wants to do a charter/non-charter straight up analysis this is I think the worlds best database -
http://www.cde.ca.gov/ta/ac/ap/apidatafiles.asp
This is for all California public schools, of which there are more than any US state, and they educate statistically significant numbers of every race, color and creed of mankind.
All data available for download, all are flat files. School test results are the records, and also school demographics and a host of other info. Schools are flagged by type including charters vs non charters. I strongly recommend using the “Similar Schools” ratings.