級

N1 階級 kaikyuu class, rank, grade N1 等級 toukyuu grade, class N1 同級 doukyuu the same grade, same class N2 学級 gakkyuu class N2 高級 koukyuu high class; first-rate N2 上級 joukyuu advanced level, high grade, senior N2 初級 shokyuu elementary level

N1 級 kyuu class, rank, grade