Fail Dispensing Exam - What can I do?

I don't know what to revise because there aren't many materials left to go through. I'm afraid they might make the exam harder this time. In the exam I failed, they used a simple case that was easy to follow using the guidelines. I'm scared I might mess up on something else in the resit. I'm so scared.
It's impossible for me to retake the year due to the huge financial burden as there are no loans available to me at the moment. The exam is very harsh. Even a single silly mistake is enough to fail. That’s exactly how I failed my last attempt. Also, they don’t grade it by marks, they assess whether you do something legally or clinically wrong. If you do, you automatically fail. It is so stressful.