A rubric is a solid group of criteria for a student's assignment that has details on grades based on pre established criteria. If your teacher didn't create a rubric yet, the first thing is to politely ask for one. Begging to change your grade makes no sense if there's no strict criteria for it and talking to the principal should be the last thing to be done.
Rich people talk funny. Oil is a sticky goo. Yarn can be made from wool. Grass can be soft. Boys are very energetic. Ivy climbs up buildings. Violets are purple flowers.
