Sophomore: Sophomore

Juvenile: juvenile

Senior students: senior students

Generally speaking, I don't say: first grade, second grade. ...

Fortunately, I looked back at the landlord's question again. Although changing the answer will "fall" from upstairs, it doesn't matter, as long as I can help the landlord answer questions. )

Supplementary answer to the question: I am a freshman; ; My first year of college.

I am a sophomore; My second year in college.

I am a junior; I'm a junior in college.

I am a senior in high school; My fourth year of college.