This study aims to evaluate the effectiveness of the online learning platform Brilliant.org in improving the academic performance of 60 tenth-grade students from four public schools in the city of Barranquilla, Colombia. A quasi-experimental design with two groups will be used: an experimental group that will use Brilliant.org platform to learn linear algebra and matrix operations, and a control group that will learn through video explanations and other resources not related to Brilliant.org. The academic performance of the students will be measured before and after using the platform, and qualitative data will be collected through focus groups with each student group at the end of the research. Advanced statistical analysis based on numerical responses will be used, including a t-test to compare mean differences between the two groups, an analysis of variance (ANOVA) to compare mean differences between more than two groups, and a regression analysis to determine the relationship between variables. The results may demonstrate a significant improvement in the academic performance of students who use the platform compared to the control group. This study can contribute to current knowledge about the effectiveness of online learning platforms in the academic performance of secondary school students in Colombia.