The Head ,
Subject (Requesting to give half days leave for appearing in the exam)
This is X (your name + Designation) wish to inform you that there is an examination from X:am till Y:am tomorrow i.e on 16th April, 2018
I therefore request you to kindly grant me half days leave, so that I can appear for such an important phase.
I am going to join the valuation camp from Xday at X:am
I will be highly thankful to you
Z (your Signature and Date)
Also Read the following 3 similar letters:-