Section 17A(4) in Tamil Nadu Recognised Private Schools (Regulation) Rules, 1974
(4)No teacher or other person employed in a private school shall be relieved from service on the strength of resignation letter. The resignation letter shall, on receipt, be sent to the Chief Educational Officer concerned in respect of teacher and other persons employed in High Schools, Higher Secondary Schools and Teachers' Training Institutes and to the District Educational Officer concerned in respect of teacher and other person employed in a Pre-primary, Primary and Middle Schools. The Chief Educational Officer or District Educational Officer concerned shall, in turn, get the confirmation of the teacher or other person employed, as the case may be, as to the fact of such resignation and then accord his approval to relieve the teacher or other person employed, as the case may be, from service.