I’ve been there, in high school and especially college. A few things helped me: 1. Practice your answers infront of a mirror until until you can say then fluently. Knowing what you’re going to say, how you’re going to say it, how you’re going to order your words, and what sounds you’re going to avoid makes a difference. 2. Practice with a parent or a good friend playing the role of teacher/professor. 3. This relaxation technique helped massively. Run through it on the day of your exam twice, once in the morning and as close as possible to when you speak. Tense every muscle group as hard as you can for ten seconds, release, take three slow deep breaths and imagine the tension leaving your body. Start with your jaw, then neck, arms one at a time (shoulder, biceps, forearms, then hands), abdominal core, and finally legs one at a time (hip, quad, hammy, calf, feet). 4. Ease in to your first sound/syllable. Before you say it, feel the tension in your jaw/mouth/neck 100%. Say it in your mind and imagine it with 50%. Then ease into the sound over 1-2 seconds. It will slide out and won’t be perceptible to the audience. 5. If your exams are anything like mine, you’ll be graded on eye contact. Pick a point on the prof/audience’s forehead right above the eyebrow. It will look to them as though you are making eye contact. This also works well on first dates and job interviews. I’ll not say “good luck” because you don’t need it. You got this. 👊