What is the format of writing an official letter?
Official letter format should include the address of the sender, the date, the address of the receiver, the subject, salutation, body of the letter, complimentary closing, and the signature along with the recipient's name and designation.
Discuss your request with them, then send a formal email with more details. Add your resume, job description, submission details and desired deadlines. You can also send them the template included below. This helps reduce their workload and increases the likelihood that they will agree to your request.
Apply at least two weeks before the letter is written to allow enough time to complete the letter, as several letters may be processed at the same time.