Hi,
You have basically two problems. First, it is a very difficult school to get in. The reason is that there is a very limited number to be accepted to 11th grade, probably 1 or 2, if there is any space and if you don't have SSAT score. Usually hotchkiss requires SSAT over 90% from applicants for 9th grade. Your TOEFL score is pretty good but without SSAT score, they won't even consider.
Secondly since the academic curriculum at Hotchkiss for the 11th is very demanding, almost like college level introduction classes, the school rarely considers an international student to come in for the 11th grade. They know international student who come late like you will suffer.
My recommendation is first to consider other schools which are academic challenging yet with flexible admission criteria and start to study there, or to complete high school in China while preparing to apply one of the top American universities. If you goal is ultimately going to one of top universities, then you can have couple options. Please contact me for more discussion regarding your academic plan in USA.
