For me, I tried heart rate lowering pills, unfortunately they didn’t help me in the presentation, but what really helped me was mindfulness, meditation, relaxation, and silence. I didn’t talk much and tested myself to see if I could say it or not. I smoked and drank soothing herbal teas. This helped me reduce my stuttering a little bit, maybe 20-30%. In real life, this worked for me a lot. I can order almost anything in a restaurant, but the problem is in college presentations because you are forced to say the word, there is no way to replace the word, so I think the stuttering has something to do with anxiety. If you can relax a lot and stay as stress-free as possible, it will get better. Good luck bro