This study investigates the effects of technology-assisted lessons on the performance and engagement of Bachelor of Science in Education (BSED) Mathematics students enrolled in Calculus II. A pre-experimental design with a one-group pretest-post-test approach was employed. The respondents of the study were the 3rd-year BSED Mathematics students of Central Bicol State University of Agriculture-Sipocot for the 2023-2024 school year. Technology was integrated into the lessons through educational PowerPoint and video presentations during two sessions. Pre-tests and posttests were conducted to assess students’ performance in Calculus II, while survey questionnaires were used to measure the level of their engagement. The results of the Paired t-test reveal a significant (N=40, t=-30.691, p= 0.000) improvement in student performance following technology-assisted lessons. Findings also revealed that the level of engagement of the students towards Calculus II improved through the help of technology-assisted lessons. The study highlights the potential of technological integration in mathematics education and provides recommendations for further enhancing students’ learning experiences in Calculus II.