YOU SAID:

i am a student in high-school , i am in 10th grade

INTO JAPANESE

私は高校生です、私は10年生です

BACK INTO ENGLISH

I'm a high school student, I'm a 10th grader

INTO JAPANESE

私は高校生です、私は10年生です

BACK INTO ENGLISH

I'm a high school student, I'm a 10th grader