More,
you seem to have quite a lot to say about the chassidishe education… I wonder if you ever dealt with someone who was educated in these schools.
I myself went to a chassidishe school and I think my english is at least slightly better than yours, from what I can tell by your writing style.
Our children are sheltered from negative influences, not from education. They can read and write English, they know Math, Science, History, etc. just as well as any other school. Most chassidishe schools take all regents and they get good grades compared to other schools.
The reason why tuition is so much cheaper in chassidishe schools is because it is a chassidus, and the chassidim all chip in to keep the school running. They don’t get all funding from tuition.