WEAR WHAT MAKES YOU COMFORTABLE::
Wear something you feel confident and yourself in. I suggest something that allows you a jacket as school gets cold. They have to turn the A/C up to make sure people stay warm. Also keep a watch on your wrist.
You never know when you're going to need the time, much like field trips. If you're in my grade, they expect you to know when to leave. So, you need to keep track of time on your own.
People will not remind you when you have to do something, and they expect you to know it yourself.
PACK EVERYTHING YOU NEED FOR A LONG DAY AHEAD::
With the ups and downs of school everyone needs some items, such as your phone, extra pencils, and pens. Flash cards, an agenda, a laptop (if your school allows), and a spare set of keys.
I wouldn't want to be left outside on a hot day, a rainy day, or a cold day. Pack carefully.
As long as you follow those two things, your day should go a bit smoother in helping you concentrate. And remember::
Yes ma'am
No ma'am
Yes sir
No sir.
Remember the teachers are there to help. If you treat them with respect, they will do the same. It'll help your school year go a bit more smooth.
But don't take it from me. I'm just a kid. But take it from someone who's been through 7 years of school. It helps.