I’m in the same boat as you friend! I’m going to be giving a speech in a competition for a full ride to my dream school. If you can nail all other aspects of presentation such as how you dress, eye contact, gestures, and actual content of what you’re saying. The way I see it they can’t fault you for your stutter so if you focus on perfecting everything outside of it, there shouldn’t be a reason they can knock you points. Confidence is a major key, if you demand to be taken seriously from your body language and tone, then you will be. Plus us stutterers get the bonus of looking brave for even speaking :) Best of luck