This study aimed to assess the performance in Social Studies with computer-assisted instruction during the pandemic among secondary students of Zambales, Philippines. This study used the quasi-experimental research design, which utilized both qualitative and quantitative techniques and used of a non-randomized pre-test, post-test and questionnaire that identified the students’ perception about CAI supplement used by the researcher as the tools in gathering data from 180 students from Grade 9 classes in a selected school in San Marcelino, Zambales, Philippines. The study indicates that most student respondents are female, young teens. The students performed very satisfactory during the 2nd Quarter. The students were rated very satisfactory in their academic performance with the use of CAI during 3rd Quarter. There was a notable increase from did not meet expectations to very satisfactory academic performance of students in Social Studies in Pre-test and Post-test. There is significant difference on the academic performance of students with and without Computer Assisted Instruction (CAI). The students agreed on the usage of CAI in Social Studies. Based on the summary of the study conducted and the conclusions arrived at, the researcher offers the use of CAI in teaching Social Studies, education stakeholders may provide computers and other digital infrastructures in schools to better implementation, curriculum planners may consider curriculum review of Social Studies in secondary schools to incorporate the CAI in teaching, contextualization of CAI, teachers may consider CAI in the classroom thru blended learning and conduct of similar study during an educational disruption may be considered.