Yeah, even in the dark old days long before the internet when I was 15 I practiced my presentations in front of my dog. I weeded out the words I’d block on, work on my word pacing and breathing. Presentations to a classroom are also a good time to use your diaphragm for speaking, doing that helps trigger other parts of your brain that are more centered on functions like singing or loud speaking/yelling which aren’t affected by stuttering like normal speech is.