The movie is about military school and a strict boss / sergeant. He is rude and mean to recruits.

I think its 1980-1990's movie.

Do you guys now any movies like this?

Many movies that has parts of the strict boss / Sergeant role. I listed a few that comes to mind. I'm sure there's plenty more. Do you have more info to narrow down the movie?

Taps (1981) - IMDb
Military cadets take extreme measures to insure the future of their academy when its existence is threatened by local condo developers.

Men of Honor (2000) - IMDb
The story of Carl Brashear, the first African American, then also the first amputee, US Navy Diver and the man who trained him.

Full Metal Jacket (1987) - IMDb
A pragmatic U.S. Marine observes the dehumanizing effects the U.S.-Vietnam War has on his fellow recruits from their brutal boot camp training to the bloody street fighting in Hue.

Annapolis (2006) - IMDb
Set against the backdrop of boxing at the Naval Academy, centers on a young man from the wrong side of the tracks whose dream of attending Annapolis becomes a reality.

An Officer and a Gentleman (1982) - IMDb
A young man must complete his work at a Navy Flight school to become an aviator, with the help of a tough gunnery sergeant and his new girlfriend.

G.I. Jane (1997) - IMDb
A female Senator succeeds in enrolling a woman into Combined Reconnaissance Team training where everyone expects her to fail.

(Sorry seem to have trouble pasting hypelinks)

Tribes. 1970