You have a good friend named Lily, 22 years old, studying in Class 6 Grade 3 No.15 high school(junior还是senior你自己没说清楚). You are in the same class, she sits at the 3rd row, but you sits at the 5th row.
You are going to school together in the morning, back to home afer school in the afternoon, and play tennis together at the end of the week usually.