Does anyone knows how to even be a candidate to have a job in UN, specifically ECOSOC body, or any international economics organization?

I am an economics undergrad student and I like to read and analyze macroeconomic reports, build models and play with statistics. I still have like two years left but what should I be aiming to in order to have the possibility to work at an international organization? UN would be cool but it's probably too difficult to get your first job there.

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