Teacher uses my stuttering to discredit me HELP

Teacher uses my stuttering to discredit me HELP Hello everyone,i've got a problem ​ I don't stutter much in day to day life but i stutter a lot when i'm under a lot of stress,like during oral [exams.Now](https://exams.Now) i have a history teacher that asks the class to revise what we previously learned in class every class,these aren't that important to our grades but still could mean a grade higher/lower depending on your participation in it. The problem is that no matter how much i've studied i always stutter and she takes this stuttering as a sign that i haven't studied properly,she uses it as a way to discredit me and give me a lower mark even though i often know the same amount as the top student and im tired of it.I could try explaining it to her but i know she'll just say some bs like "no u just haven't studied enough" and move on. I could tell the school admins but this school is in a very small town and they often don't do anything with these types of complaints so now i'm really stuck and i don't know what to do,i'm sick of her making me feel dumb.