YOU SAID:
I am a student in ### grade and I am ## years old
INTO JAPANESE
私は ### 学年の生徒で ## 歳です
BACK INTO ENGLISH
I am in ### grade and I am ## years old
INTO JAPANESE
私は ### 学年で ## 歳です
BACK INTO ENGLISH
I am ## years old in ### grade
INTO JAPANESE
私は ### 学年 ## 歳です
BACK INTO ENGLISH
I am ### grade ## years old
INTO JAPANESE
私は ### 学年 ## 歳です
BACK INTO ENGLISH
I am ### grade ## years old
Come on, you can do better than that.