noun, noun or participle which takes 'suru', intransitive verb
promotion to the next grade; advancement in rank
Used for moving up to the next grade in school or advancing in rank within military or similar hierarchical organizations. Often used with する to mean 'to be promoted' or 'to advance'.
彼は成績が良かったので、次の学年に進級した。
He was promoted to the next grade because his grades were good.
軍
Advancing in rank in the military requires rigorous training.