Firstly, manage your time if you want to be a responsible student. You must come to class on time and is always ready to learn. Don't be a minute late and bring everything you need for the classes on that day; the right note-taking materials, your homework, lunch, etc. Be organized with all the time.
Secondly, respect your teachers. Even if the things you're learning aren't exactly interesting, just pretend they are. Smile at your teachers and be nice to them. Respect the grade they give you and be patient with your teachers. In addition, always behave in class. Don't fool around with other classmates or with an object. Pay attention and listen closely to the teacher. If another student starts talking to you, quietly tell them to be quiet and listen. If they still don't stop, just ignore them. If others are being bad during class and you take the blame for it, consider telling the teacher about this person if you feel comfortable. If not, try to ignore it as much as you can, and if the teacher calls you out, stand up for yourself, or talk to the person or the teacher afterwards.
Thirdly, take notes. This is very important to do, especially if you want to achieve good grades. Take notes neatly in a notebook. You don't have to copy every single thing the teacher says, but jot down