TEACHERS' READINESS, CHALLENGES, AND SUPPORT NEEDS IN THE IMPLEMENTATION OF THE STRENGTHENED SENIOR HIGH SCHOOL CURRICULUM AND LEARNERS' ACADEMIC PERFORMANCE IN CORE SUBJECTS IN MANGAGOY NATIONAL HIGH SCHOOL, BISLIG CITY DIVISION: A DESCRIPTIVE SURVEY - Espiel, Kevin B.; Antiquina, Anrey G. (International Journal of Advance Research and Innovative Ideas In Education, 2026)