How to get NOC

Hi SIR,
Myself MUTHU kumar, presently i am working as a ALP in SWR. I.ve applied a post in TAMIL NADU TEACHER RECRUITMENT recently. I want an NOC letter from my deptt fro that. Kindly provide me the rulings for this. what are the rules for applying new govt job being a govt officer for getting NOC.

Regards
MUTHU KUMAR

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