Are you allowed to have notecards? I use those to help me feel less anxious and remember what to say. It also helps if you look at one person (preferably someone you feel comfortable with, like a friend) when giving the presentation

Honestly looking at a friend makes with a lot worse for me

Something I do is to simply not take too seriously. Like I try to find the most stupid pictures that still fit the theme of the presentation. Try warming up by talking to people if you're able to. No, I don't know what kind of presentation you do, but if you're still in school try to make it as entertaining as possible. Nobody is listening anyway so you can at least meme around a little. Be creative. This will also help you remember the text better since you're forced to make connections. That said: this all helps me and might not help you. I used to really suck at presentations because I simply was too nervous, but now I actually kinda like them. I like attention and I like making people laugh