I applied through college or university. The process took 1 day. I interviewed at United Nations in Jul 2014
Interview
Required to pass a clerical test that was fairly easy. Then we met briefly with the supervisor. We heard back relatively quickly with the results. Most of us received a job offer to join the UN for a four month period during the General Assembly.
Interview questions [1]
Question 1
I cannot remember the exact interview questions as this was several year ago, but it was not a difficult interview process.