Problem with converting grades from Hong Kong

I’ve attend my 7,8,9 grade in Hong Kong. The grading system between Hong Kong is different than the one in US. I was wondering should my school in U.S. only calculate the gpa for 10,11,12 grade?

It’s NOT your job to convert GPA.

Either the college you apply to will evaluate it or you have to use 3rd party to “translate” it to US grade