I have two presentations on Monday

I have two presentations on Monday Like the title says, I'm gonna have to do two presentations in one day. I'm trying really hard to be confident and not let the anxiety get to me but everytime I remember them I cant help but think I'm gonna embarrass myself in front of my classes. One presentation is going to be in front of college students as well (I'm a high schooler taking dual enrollment). I really want to present both projects cause they're obviously for a big grade and I dont want my stutter to hold me back anymore. Does anyone have tips on how to gain more confidence?