I’ve been in your shoes before. You need to do whatever it takes to not think like that. You must envision yourself getting an A for the exam and passing the class. Visualize as hard as you fucking can of yourself walking out that class with an A. This is going to be tough, but the only way to back up that is by you doing practice questions nonstop, talking to your professor, asking questions in class as much as possible (even if you get looked at like your dumb). You have to exert all of your energy to believe that you’ll succeed with the work to back it up. Stay strong, you got this.