teacher's pet

the teacher's favorite student. (*Typically: be ~; become ~.) Sally is the teacher's pet. She always gets special treatment. The other students don't like the teacher's pet.

A person who has gained favor with authority, as in Al has managed to be teacher's pet in any job he has held. This expression transfers the original sense of a teacher's favorite pupil to broader use. [1920s]

Someone who seeks preferential treatment. A derisive epithet hurled at a student who tries to curry a teacher's favor in hopes of a better grade. Such a charge, valid or not, often led to cloakroom or schoolyard challenges and bloody noses. Outside of school, it was applied to people who insinuated themselves to authority in the hope of special treatment. The French equivalent is “teacher's little cabbage.”