teacher's pet
US /ˈtiː.tʃərz ˌpet/
UK /ˈtiː.tʃərz ˌpet/
1.
a student who is liked best by the teacher and is treated better than other students
:
•
Everyone in class thought she was the teacher's pet because she always got special treatment.
•
He was always the teacher's pet, volunteering for extra tasks and getting praised constantly.