How am going to plan my four-year university life?

Everyone said the university life is free and interesting, not only in classes but also after classes. I am a freshman now. It is no doubt that everything looks attractive, including classes and many activities. It makes me think that the time management is important because I want to experience different things, but I only have twenty-four hours a day.
Time management is my first work which I should do in first year. First, think twice before I choose which association I want to join, just like volleyball team or chorus. Then, balance the finite time between activities and study. I would like to remain at least four to five hours to study everyday.
In second year, I want to take part in the activities I choose deeply and to learn communicating with various people. Then, make myself more confident and responsibility during the process. I also would like to learn the related or the outside knowledge of my major subject by reading science magazine or visiting exhibition and museum.In the third and last yeas, it is time to prepare for the graduate school test. I don’t want to do unnecessary things except for the study. Put the emphasis on study and do my best during these two years, I hope that I can enter the better graduate school. All above is the things that I going to do during there four years.