The study looks into how communication apprehension in public speaking affects SHS students in Biñan City. It identifies underlying factors that contributed to their public speaking anxiety. Using mixed methods approach, quantitative and qualitative results were merged to determine the convergence or divergence of the data. The responses are examined using different methods of analysis: a) written interview through an open-ended questionnaire b) standardized PSCAS questionnaire c) semi-structured interview d) Duncan ANOVA e) convergent parallel. The findings revealed that the majority of SHS students are moderately apprehensive in using English when communicating and participating in oral presentations and discussions. Through factor analysis, results have revealed five independent factors contributing to their CA in public speaking namely fear of negative evaluation and anticipated criticism, word content and grammar, teachers’ evaluation, self-doubt and hesitation and lack of preparation and readiness. Moreover, it reveals the significant differences among five factors when they are grouped according to their level of CA in public speaking. Both quantitative and qualitative data indicate convergence and shifted positively in response to the methods utilized.