YOU SAID:

I am a junior in high school and graduate in a year

INTO JAPANESE

私は高校3年生で、あと1年で卒業します

BACK INTO ENGLISH

I'm a senior in high school and will graduate in a year.

INTO JAPANESE

私は高校3年生で、あと1年で卒業します。

BACK INTO ENGLISH

I'm in my third year of high school and will be graduating in a year.

INTO JAPANESE

私は高校3年生で、あと1年で卒業です。

BACK INTO ENGLISH

I'm in my third year of high school and will be graduating in a year.