You can't say that is why they do better. Maybe that is why they do better. In my experience with charter schools (tech magnet schools in NYC, Delware charter

You can't say that is why they do better. Maybe that is why they do better. In my experience with charter schools (tech magnet schools in NYC, Delware charter schools) entry is competitive. Of course charter schools will do better if their students start out smarter. And in other cases, it is at least elective. If your parents care enough about your education to sign you up for a charter school, aren't you already more likely to do well in school than the kids with parents who don't care that much?