Got your report card? The results weren't what you were expecting? Remember that it's ok! Bad grades aren't the end. Instead of losing hope and giving up, you should try harder next time. 

Bad grades won't change themselves you know.. you can make an effort by making sure all your tasks are done and keep your working space organized. Listen well and participate in class. Pay attention to the teacher and take notes. Remember that it's ok to ask, don't hesitate. Do all you homeworks and study rountinely. Take breaks when you are studying. Your brain also gets tired.