In the 21st century, the demand for individuals with specific skills has increased rapidly due to the fast-paced and constantly evolving nature of our society. The workplace has become more competitive, and employers are seeking employees with a diverse set of skills that go beyond academic knowledge. Thus, it is crucial to equip K-12 students with these 21st century skills to ensure their success in the future. This study aimed to determine the level of 21st century skills of selected K-12 graduate students in Victoria Senior High School and identify the gaps and areas for improvement in the current curriculum. A total of 84 graduate students were selected using purposive sampling from the different senior high school programs offered by the school in Victoria Senior High Public School and 30 graduate students were selected in Private School. The 21st century skills were measured using a self-reported questionnaire adapted from a self-made questionnaire. The results showed that the overall level of 21st century skills of the students was outstanding, with information, media, and technology, learning and innovation, communication, and life and career skills being the strong agree for public schools. However, 21st century skills from private school were very good results. Based on the findings, there was a significant difference on the 21st Century Skills among the K to 12 Graduates between public and private schools.