After a country-wide full blast implementation of a K-12 program, a detailed assessment of the curriculum has to take place. This study analyzed the General Mathematics competency of 425 Grade 12 students during the 2017-2018 school year. The study employed a validated researcher-made General Mathematics Competency test with an acceptable 0.788 Cronbach's alpha. Results showed that all strands in the Technical Vocational and Livelihood (TVL) track, and the Accountancy, Business, and Management (ABM), Humanities and Social Sciences (HUMSS), and General Academic (GA) strands of the academic track were fair in competency. Only the Science, Technology, Engineering, and Mathematics (STEM) strand got a satisfactory level. Between the two tracks, the academic track has significantly different competency compared to the TVL track. On the academic strands, STEM has significantly different competency compared to other strands. On the TVL strands, Computer Servicing System (CSS) has significantly different competency compared to the other strands. Moreover, data revealed that the least learned competencies of students were distributed in the three areas of General Mathematics. The data may indicate that high school seniors have not yet mastered the necessary competencies in the subject matter as stipulated by the Department of Education.