YOU SAID:

I once had a good grade in school until I took my math test.

INTO JAPANESE

数学のテストを受けるまで、学校で良い成績をとったことがあります。

BACK INTO ENGLISH

I have done well in school until I took the math test.

INTO JAPANESE

私は数学のテストを受けるまで学校でよくやった。

BACK INTO ENGLISH

I did well at school until I took the math test.

INTO JAPANESE

私は数学のテストを受けるまで学校でよくやった。

BACK INTO ENGLISH

I did well at school until I took the math test.