____________ (School Name)
Subject: Requesting permission to write exam
With utmost courtesy, I would like to inform you that I am ________ (name) and I study in _______ (class) of your reputed school i.e. _____________ (school name). My roll number is _________ (mention roll number).
Most apologetically, I would like to inform you that I have an examination today i.e. __/__/_____ (date) and as per the requirements I am supposed to present my ID card in front of the invigilator for getting entry. But, I beg to inform you that I am not having my identity card as _______ (ID card got lost/ forgot to carry/other).
Therefore, I request you to kindly allow me to attend the examination and give me a written approval so that I can give the exam.
I shall be highly obliged for your kind support. I ensure that this would not be repeated again and I will carry the ID card in future exams.
____________ (Roll number)