I do knew a US white girl is like this in 6th grade. she isn't jewish girl and not jump a grade. just like a normal girl you see every day. I don't see any kid smarter than her so far.
So please show us how smart your kid and next time every one in here will use your kid as an example. Next time I will proud to tell school teacher that 中国很普通学生 will easyly get SAT 2400 or ACT 36 at 6th or 7th grade. Even more MCAT easyly for 45 for 中国很普通学生.