Hi Lavanya,
Please note that all leaves need approval by the reporting managers/officers. Any leave obtained without prior approval may lead to absenteeism, which shall be considered as a loss of pay.
Approval can be recorded in the leave register, leave application, or even through email. It is advisable to obtain prior approval for planned leaves. For unplanned leaves, it is better to seek approval via phone or SMS initially and later follow up with a formal email or leave letter.
Teachers can send an email to the principal for approval, and the principal can respond via email as well, which can serve as evidence of approval.