In general, the result of dreams is two aspects, one is to remind yourself. Another one is related to health.
Although I said in my dream that I couldn't pass the exam, I will work hard. This is not to say that it is possible.
Nowadays, the interpretation of many dreams is actually the opposite of reality. So I said in my dream that I couldn't pass the exam, but in fact your grades may be good.
Your achievement is entirely achieved by your own efforts. So don't believe these analyses. Still have to believe in your own efforts. Only by persisting in learning, finding suitable methods and laying a good foundation will the grades improve quickly.