If you were chosen to be a prefect at your school, this is a great honor. Make sure that you know how to do it well though! Here are some tips.

[edit] Steps

Learn public speaking skills and elegant writing skills book of knowledge
Try to be fair to everyone. Even if you dont like the person, they should still be treated like everyone else.
Be very happy and always smile! This will make you much more approachable and less bossy.
Give students help with school work, and if you see someone drop their books, help to pick them up.
Always try to get good grades. Study and do your homework.
Don't be afraid to ask questions and don't be afraid to answer!
Don't be afraid to tell on your friends if their doing something bad, it will help them and the students around them
Be nice to teachers. Always respect them no matter what. Even if they assign a 'huge' project or accuse you of something you didn't do.
Be on time to your classes.
Always show up to school unless you are truly sick and its contagious.
Get involved with sports and clubs
If you have a school uniform, always respect that!
Above all! Always have a relationship with God..