The COVID-19 pandemic necessitated significant modifications in educational approaches to improve the student's academic achievements. This research aims to assess the academic performance of students in basic civil engineering courses during and after the pandemic. The study focused on students taking critical civil engineering courses (Solid Mechanics, Fluid Mechanics and Soil Mechanics) within the Diploma in Civil Engineering program. The analysis covered two student groups from the 2020 and 2022 academic years, which represent the periods during and after the pandemic. Additionally, teaching methods were entirely online during the pandemic and completely in-person afterwards. Student performance was evaluated using descriptive statistics by examining the pass rates and grade distributions for the courses. In brief, the findings indicated that students performed better in these core courses during the pandemic compared to after. These insights may assist educators in selecting effective teaching materials and assessment methods to enhance student outcomes in the post-pandemic era.