You go to school at a certain time and return at a fixed time. This action is carried on unfailingly for 6 days without fail. We can call this action/motion of yours as periodic motion.
For a motion to be periodic, it must repeat itself after regular intervals of time. If T is the time period of an object under periodic motion, the position of an object at an instant should be the same as the position after time T. In other words, the motion should be exactly similar in every period of motion and must follow the same path. Therefore, your motion, in this case, is not periodic motion.