Prepare. Prepare. Prepare. Know what you're talking about. If you're confident in the material your speaking about it could triumph over your fear of stuttering and within a little while your time will be up. My problems can from focusing so much on stuttering and embarrassing myself in front of my peers. I'd psych myself out and put all this pressure on myself that wasn't there before. I learned, the more I know the more confidence I get going into each presentation. Nobody likes to present. As many times as you've heard it you'll hear it again and again. You can prepare by practicing your cadence. I tend to speak slow because I noticed when I forced words out I flustered myself and stuttered a lot more. My last suggestion is to go 1st or after someone who struggled themselves. But always makes for a satisfying sigh of relief when you get to watch everyone else take their turn after you. Good luck!!