word request - Someone who gets an advantage by sucking up someone else

What do you call a student who always sucks up to the teachers / professors in order to gain better marks or an employee who get a promotion by complementing a higher manager or boss etc. in the polite and impolite way?

Answer

You could call the person a suck-up, or a brownnoser. These two are insults.

• suck-up
  a person who tries to get the approval of someone in authority by saying and doing helpful and friendly things that are not sincere


• brownnose
  
  : to try to get the approval of (an important or powerful person) by praise, flattery, etc.