This is the 676th most frequent Chinese word.
级
"级" (jí) means "level," "rank," or "grade."
“级” in this sentence describes the level of difficulty.
这个问题的难度是中级的。
The difficulty of this question is intermediate.
“级” refers to a rank or hierarchical level.
他晋升到了更高级的职位。
He was promoted to a higher-level position.
“级” is used here to denote a grade or year in an educational context.