What a good application must contain: your address and the date at the top right or left; the Principal's designation and school address; a clear Subject line; the salutation 'Dear Madam' or 'Dear Sir'; three short paragraphs — the request with dates, the assurance about school work, and the closing request; and 'Yours sincerely' with your name, class, section and roll number. Formal language throughout — no contractions such as 'I'm' or 'don't'.
Sample answer:
14, Kaveri Street, Anna Nagar
Madurai
Tamil Nadu – 625020
18 August 20XX
The Principal
Kendriya Vidyalaya No. 2
Madurai
Tamil Nadu
Subject: Request for leave for four days
Dear Madam,
I am writing to request four days leave with effect from 22 August to 25 August 20XX in order to attend my elder sister's wedding at our hometown, Thanjavur. As the whole family is required to be present for the ceremonies, my parents will be travelling with me and I shall be away from Madurai for those four days.
I would like to assure you that I would complete all the work covered in my absence. I have requested my classmate Nithya to keep a note of the lessons taught and the homework given, and I shall copy the notes and submit all pending assignments on 26 August, the day I return. I shall also be carrying my Science and Mathematics books with me so that I do not fall behind in the revision for the unit test.
I would be grateful if you could grant me the leave.
Yours sincerely,
R. Meera
Class VII-B, Roll Number 21