For letter, learn the format properly and write in the stipulated word limit provided. The complete letter writing for PO Mains exams.The document provides tips and samples for writing letters. Some key points include: 1) It outlines the proper format for formal letters. In this video I'm going to write one sample formal letter for you now as you know in descriptive English you have letter writing as well. Below is a list of frequently requested Human services forms. Click on the form to complete and print.