Do not slack in ninth grade because you need to learn to do your work and not procastinate. When you start making excuses you are not going to do it. Just get up and do it.
Easy come, Easy Go
Mom, get out!
Get to learn someone before making a general statement about them and learn about everyone so you can have friends. Everyone is doing something in their life and everyone is doing it differently. If you would not want someone to judge you, why judge them?
Gather ye rosebuds while ye may
Study smart and consistently because the second you stop you will become like everyone else. Having and setting a goal is also important because it adds more fuel to your consistency.
You have to take the good with the bad
Stay focused on your goal and you will not fall off. Things will come and try to throw you off but be strong and stay on track.
Live your life and be very active because you only get one life and only one time to be a teenager. Have fun responsibly and try to give and get positivity towards others.
If you have bad teachers or annoying classmates just learn to find the funny stuff in what they do so that you can cope with it. Things will come at you with a negative purpose and make the positive come out of it.