Abstract
This study aimed to determine the ancillary functions and teaching performance of secondary public-school teachers at Mayamot National High School, District I-D, Division of Antipolo City during the School Year 2022-2023 which served as basis for school internal policy formulation. There were 20 teachers and 15 administrators that consisted of the school administrators, master teachers, and head teachers who answered the researcher-made questionnaire. It was revealed that both school administrators and the teachers themselves, perceived that the teachers are partly involved with grand weighted mean of 4.17 in handling the different ancillary functions such as grade level coordinators, coaches in academic and non-academic contests/sports, canteen managers, clinic teacher and other ancillary functions. Likewise, it showed that both the school administrators and teachers, despite the ancillaries assigned to them, they were still able to manage the challenges they encountered in performing their main function as teacher about instruction, material preparation, and time consciousness. Moreso, 50 percent of the teachers obtained an Outstanding, while the other 50 percent performed Very Satisfactory performance based on their IPCRF.