The preparedness and performance of Grade 10 students in prerequisites of STEM mathematics was the subject discussed in this study. General findings pointed to the fact that most students exhibited "Satisfactory" performance scores in key areas, with some readiness gaps seen in certain areas such as the Law of Exponents and Logarithmic and Exponential Functions rated "Low" to "Moderate". Readiness was highly associated with performance on some of the specific competencies - namely quadratic equation techniques and formula manipulation, but not others; readiness cannot be inferred from performance alone. There is a suggestion to design strategic intervention materials that would close these gaps and refresh skills in critical areas of mathematics. The SIM should have activities that are structured, ways to motivate and support instruction towards the goal, so that there is a bridging between readiness and performance. Overall, it points out that what matters is a focused intervention for improving readiness among students in advanced STEM mathematics-prepared better for future academic and career challenges in STEM disciplines.