Personal History Form is also called P-11 form. A good P-11 form with a cover letter is the shortest way for the interview.
The UNDP Personal History Form (P.11) or e-Recruit online application is mandatory for all recruitments and selections and relevant candidate information on these matters requires verification and, in particular, the candidate’s employment history for purposes of reference-checking. Please see UNDP’s Policy on Academic Qualifications which spells out specific criteria for
First of all, you need to download the latest download Personal History Form on the website of the organization that announces job position. UNHCR. UNICEF, UNDP have a little bit different p-11 forms.
Here is some latest version of Personal History form.
United Nations Office on Drugs and Crime
Here a good sample how to fill in P-11 form correct.