If you want to do the presentation, tell to your professor that you really want to do it, and if they say no, make them feel that it's discrimination, they should feel bad for it. The tip that helped for me is to practice at home the day before, multiple times speaking alone and repeating what I will say, so I get familiar with the text. Often 2 times is the minimum I recommend for even a non-stutterer. 5 is too much, you should give room for impro : an advice, try to change the script sometimes, don't follow one, so when you will have forgotten a line during the presentation, you will be able to quickly improvise / or be prepared to cut the things you forgot. By preparing before, I ended up with better and better presentation. And as I was preparing them better than others, I even got some where I received the best grades of the class actually, I was quiet proud of it !