I think you’re a very competitive applicant to Stern. Only one thing stands out as weird on your application to me. You got an 800 in the Math subject test but only a 600 in the regular SAT? What happened there? You’re clearly good at math, so is it possible to retake your SATs and aim for a higher math score?
Also, I just have to point out though that if you apply anywhere that requires SATII scores, you might not be able to use the Chinese test if you’re already fluent in the language (which I assume because Chinese school + your background).