The academic performance of IIUM's Centre for Foundation Studies students, particularly those who are in the engineering program, continues to receive attention in the research community. However, there is a lack of studies that examine the simultaneous effects to the competency in mathematics and physics on their academic performance. This paper links the relationship between mathematics and physics competence on their academic performance. This work adds to the database of knowledge in engineering education and has effects. Initially, the research offers an enhanced comprehension of the student's academic achievements. To provide a better training and guidance environment for students, this goal is to assist educators, teachers, mentors, college administrators, and other relevant parties in understanding the unique variations among students. Secondly, a deeper examination of engineering students' proficiency in physics and mathematics would help them figure out their skill set. This study's respondents are 256 engineering students from IIUM's Centre for Foundation Studies. Cumulative Grade Point Average (GPA) was used to measure student achievement. Examination score from six courses were analysed which includes three level of mathematics courses and three level of physics courses. The data was examined using descriptive and multiple linear regression methods. The findings show that most of the courses had a significant correlation with CGPA above 0.7 except Mathematics 1 (0.622). Physics 3 was the most significant predictor, followed by Mathematics 3, Physics 1 and Mathematics 2.