Yesterday I also had a presentation to give in my class and I was insanely stressed but I had some tips that helped me deal with the stuttering. 1. Remember to take breaths every few words and not when you feel like you are literally suffocating. 2. Read at a speed that is comfortable for you and not at the speed that the others are reading at. 3. And don't be afraid to stutter and if you happen to stutter, stop for a moment take a breath and continue. good luck :)