For me, I like to volunteer to go first. It takes away the pressure to be as good as the person before you. You get to set your own standard. Another bonus is you get to relax for a few days while the rest of the class does their speeches. It also helps to practice your speech enough times, but not too many. I've found that if you practice too many times your speech sounds over rehearsed and memorized. Good luck!
Have good eye contact. During speeches, I have a habit of staring at one person. So, I try to look at the wall behind them. It helps me concentrate too. Another important tip is to have plenty of practice beforehand. The more you practice, the better your speech will be. After all, practice makes perfect!