YOU SAID:

I finished high school, but before that I finished middle school, before that I finished elementary school, before that I was born

INTO JAPANESE

私は高校を終えましたが、その前に私は中学校を終えました、私は小学校を終えて、私が生まれた

BACK INTO ENGLISH

I finished high school, but before that I finished junior high school, I finished elementary school and I was born

INTO JAPANESE

私は高校を終えたが、その前に私は中学校を終え、私は小学校を終え、私は生まれた

BACK INTO ENGLISH

I finished high school, but before that I finished junior high school, I finished elementary school and I was born