How to improve speaking skills?

I, 18(F), am in my first year of college. We have a class that's full of impromptu speeches, and a lot of my other classes have presentations that I'm genuinely struggling with. I got by fine in highschool because we usually have group works, and someone in said group often has someone who volunteers to speak.

I have social anxiety and a bad stutter. The only way I can present something well is if I was reading a speech because it's easier for me to modulate my tone and voice when there's a clear script for me. But my teachers now don't allow even flashcards, so I usually fumble my entire way through without a clear point to whatever it was that I said. Pls help a girlie out 😭