I rarely stutter during presentations or anything prepared so not exactly the same. However if I got called out in class I would often stutter e.g. if a teacher wanted an answer. Honestly what made me feel comfortable was not trying to hide it, people knew I would stutter, I knew, so it wasn't really something I could be made fun for and I would find humour in it. And because of that people wouldn't bully me for it etc. If a teacher did that I would speak to them after class though and explain it to them so they understand for next time