1.) Don't throw your cellphone when you're mad.
2.) Don't use headset in the class even there's no teacher.
3.) Try to not often says "F**k".
4.) Stop complaining.Nobody's perfect. When you're not statisfied, just take a breath and say, "I'm unstatisfied" with a good tone.
5.) PAY ATTENTION MORE TO TEACHER. STOP HATING TEACHERS.
6.) Turn off the cellphone while the school time.
7.) Try to nice to anybody.
8.) No more sarcasm. Sometimes it helps, but that's not a good way.
9.) No more negative thoughts. Search to find the truth.
10.) All things bright and beautiful.