Letter for Leave for attending classes

From:-
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To:-
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Dear Sir,

Sub:- Requisition of leave to attend Practical classes- reg

I would like to seek your permission to attend my 'course' practical classes which is  scheduled to be start from 'date' to 'date'. As my attendence is compulsory to get eligibility to write exams i hereby requesting you to please grant me leave for the above said period. Kindly do the needful.