I have to take 3 language certificate exams in the next 4-5 months and I’m terrified about the Speaking part.

I have to take 3 language certificate exams in the next 4-5 months and I’m terrified about the Speaking part. I’m taking IELTS, Goethe Zertifikat B1 & B2 (German) in the upcoming months. And just the thought of sitting through a 15 minute exam where someone is going to evaluate my speaking skills makes me wanna bash my head against a wall. It’s just sheer bad luck for us who stutter. Does anyone have any experience regarding this? And just for context, my stutter isn’t severe but it happens a good amount of the time, But I have really nasty blocks when I’m under pressure.