This is a predictive modeling project using R and the Pisa2009 dataset. It was originally a class homework. I wrote the first version on July 2021 and found that there were something wrong, so I editted it and uploaded the final version. I tried to predict the model by integrating all the basic modeling knowledge I learned in this class. Maybe I will modify the model after I learn more about machine learning and data science. Please feel free to offer suggestions and thoughts!