I don't know what the statistics are either, but here in SoCal, homeschooling and JW schools were very very popular years ago. I think parents were trying to do what they thought was the best for their kids, but I don't think the result overall was that good. I know lots of kids that rebelled big time and left.
Being in school as a JW brings its own pressures. I was a nervous wreck having to "take my stand" to every new teacher in grade school. Alone in the library during holiday festivities was tough but not unbearable. It's weird thinking about it now.