The graduation of the first two batches of the Filipino senior high school (postsecondary) graduates calls for an examination of their college readiness since admission to tertiary education is one of the curricular exits of the K to 12 Program. Using the College Readiness Test (CRT) as a criterion-referenced measure, this study determined the college readiness of the K to 12 graduates based on the overall CRT results and specifically in its seven (7) learning areas namely English, Filipino, Literature, Mathematics, Science, Social Studies, and Humanities, which ought to be mastered in the K to 12 Program. The test of concurrent validity has proven that the CRT is a credible measure of college readiness in these learning areas. It has also ascertained this concurrent validity of the CRT in relation to a College Admission Test (CAT), which is a norm-referenced test that measures the college readiness of K to 12 graduates admitted in one public university in the north-eastern part of the Philippines. As a descriptive-correlational research and using 7,533 K to 12 graduates as respondents, it was found that overall, the K to 12 graduates were college-unready. They poorly performed in Science and Mathematics but manifested college readiness with languages and literature. Also, campus assignment plays a significant variable in explaining the differentials in the college readiness of the respondents. On the whole, the study offers manifold benefits for policy reforms along curriculum alignment, tertiary admissions, and transition interventions to improve the quality of the K to 12 graduates.