That is cruel of her. I am sorry you are having troubles like that. When I took an exam to get to graduate school, I had a nosebleed in the maths portion and was afraid they would discover I was sick and make me stop the test. I did not do well on that test but many years later, I did fine.

Can you not do well on the test and take the course from someone different next time? My husband did that with French; he took it in Japan from a native Spanish speaker and was all confused so that when they put him in the next level, he just said, "no" and failed it and took it again.

Make your education work for you; learn what you can for yourself and keep working for yourself and eventually you will get to the level you want. Sorry you have to struggle with this teacher though.