Why is a college student in her second year referred to as a “sophomore”?

After her first, or “freshman,” year, a college student is called a “soph-
omore,” and has been since the description emerged at Cambridge in
1688. The word is constructed from the Greek sophos, meaning wise,
and moros, meaning foolish. So a second-year student is somewhere
between ignorance and wisdom. Similarly, when we say something is
“sophomoric,” we mean it is pretentious or foolish.