Also, it is exactly like how charter schools often have worse scores than the public schools that feed them.
Charter schools in Texas,
classified by type: in the greater Austin area, there are 30 charter schools.
--4 are non-members and thus unclassified, but I happen to know that two are for special needs kids, one is for delinquents, and one is an alternative Montessori-style curriculum where you don't get grades
--12 are "college preparatory"
--7 are "dropout recovery" or "RTC/JDC" (meaning a judge ordered attendance)
--7 are "specialized mission" (this includes those with a narrowly focused curriculum, like professional-level fine arts or vocational skills, as well as the school for extracurricular prodigies that compacts bare state requirements into a 4-hour day so the kids can spend the rest of the day playing violin or doing gymnastics or whatever thing they do.)
Based on the above, I believe you could make the claim that no more than half of the charter schools are likely to have higher-than-average test scores. The others will be lower.
But there's no need to derail the thread, it's all been
said before, anyway.