請問「在..得到好成績」的英文

如果是指科目名稱的話, 一律用 in:
I got good grades in English.
I got good grades in Chemistry and Computer.
How do I get good grades in math?

如果是其他事物的話, 就不一定用in了:
I got good grades on English exam/test.
I got good grades on the English essays.
I got good grades on my English report.
I got good grades on my business courses.
I got good grades in school. ← 較at school普遍
I got good grades at university.
I got good grades for grammar and reading.
I got good grades for my first semester in graduate school.

I got a better grades in + subjets

I GOT good grades IN English.

一班情形下:

In + 不可屬名辭

On+可屬名辭

At+ 特定名詞