NEW DELHI, FEBRUARY 28: The Delhi High Court has quashed the promotion of a Navyug School headmistress to the post of principal, saying it was in violation of government's recruitment rules.In a recent judgement, Justice K. Ramamoorthy said the New Delhi Municipal Council (NDMC), which runs the school, had no authority to prescribe or reduce qualifications for the post given in the Delhi Administration's Recruitment Rules.Raj Bala, a headmistress with the Senior Navyug School at Peshwa Road, was promoted to the post of vice-principal in 1990 and shortly thereafter as principal. The parents' association of the school and a senior teacher at the Navyug's Sarojini Nagar branch challenged the promotions, terming them ``arbitrary and illegal.'' Raj Bala would not have satisfied the qualifications prescribed even for the post of vice-principal, the petitioners claimed, but for the changes made by the NDMC in the prescribed recruitment rules. The petitioners accused the New Delhi Municipal Council of bending the rules to favour the candidate.