I was so self conscious of my stutter throughout all of high school. In college, I started telling my professors the beginning of each semester and they were super understanding. I only got therapy at a VERY young age, up until I was about 6, and then i had speech therapy once a week during school up to middle school. I’m not sure if you had free therapy from your school, but those skills stayed with me for life so I would recommend just watching some videos from speech pathologists talking about what to do when you’re stuttering and the best ways to alleviate the stuckness, repetition, etc. As for your presentation, and I know this is harder than it sounds, don’t stress over it. You have your script, you roughly know what you’re going to say, all the students and your teacher are FORCED to listen to you, so talk to your hearts content until the bell rings. Even if you stutter so much throughout the whole presentation, there’s no way the teacher is letting class dismiss when you’re still presenting. Throughout college and work, this is what really helped me, that people are getting paid/are paying to literally hear me study for the next 5–30 minutes given the length of the presentation. Your stutter doesn’t affect what you say, it only affects how you say it. You may swap out a few words or phrases for problem sounds you have, but the gist of it is all still there. Give it your all and you got this (: