The document provides tips and samples for writing letters. Some key points include: 1) It outlines the proper format for formal letters.A candidate should be grammatically strong and should strictly follow the formal or informal letter writing format. A candidate is required to write an essay and a letter in a time duration of 30 minutes. Letter writing tips and sample practice letters for IBPS PO Main Online Exam 2017. One of the most important banking exams in India is the IBPS PO Recruitment Exam. Formal requirement: Especially for letters, strictly adhere to the prescribed format. Not doing so might lead to your marks being deducted. Check here what is letter writing for IBPS PO mains 2023, and other bank PO exams. The duration of the test is 3 hours 30 minutes.