This depends on the location of the interview considering cultural barriers and deferences in the deferent locations.
You must do a security check to ensure you have not been convicted before.
You must not be minor
You must be willing to keep the United Nations code of conduct as long as you are a staff
You must be willing to keep the UNICEF code of conduct as long as you are a staff
Does UNICEF require pre-employment background checks? What kind of background check does UNICEF do and how long does it take to complete?
Yo must to be highly Recommended,skills &experience.
And use and acceptance of time prame at unicef.