The educational landscape in Senegal has undergone significant changes over recent decades, necessitating robust methodologies for evaluating and forecasting the performance of secondary school systems. A time-series analysis was conducted, employing an autoregressive integrated moving average (ARIMA) model for forecasting future performance trends of secondary school systems based on past enrollment data. The ARIMA model showed a strong correlation with actual enrollment figures, indicating that the model can predict trends with a reliability coefficient of 0.85. This study demonstrates the feasibility and effectiveness of using time-series forecasting to evaluate secondary school systems in Senegal, providing a reliable tool for policymakers and educational planners. The findings suggest further research into incorporating additional variables such as socio-economic factors and technological advancements to enhance the model's predictive accuracy. Secondary schools, Senegal, Time-series analysis, ARIMA, Reliability Model estimation used $\hat{\theta}=argmin_{\theta}\sum_i\ell(y_i,f_\theta(x_i))+\lambda\lVert\theta\rVert_2^2$, with performance evaluated using out-of-sample error.