It can be seen from your dream that you are very anxious about the exam. Both dreams are awakened and can be judged as anxious dreams. From the end of Dream 2, we can see that the source of your anxiety comes from your family. Your parents may give you a lot of pressure, perhaps unintentionally or obviously, but judging from your state, you are under a lot of pressure.
These two dreams are actually a kind of self-release of your pressure. In the first dream, I dreamed that the order of the test papers was reversed, which hardly appeared in reality. In fact, this is because you didn't finish the test paper in your dream (because the order is reversed, so you didn't finish it). Why are you looking for reasons? It is because you are afraid to face the doubts of your family that you find the reason to free yourself. In fact, the subconscious mind only does this because you can't find a suitable way to relieve stress in real life. This kind of pressure is a bit unbearable for your spirit, and you can't handle it. So in your dream, the subconscious mind uses its own method (randomly compiling test papers) to relieve your stress. The same is true of the second dream (it is impossible to have papers on different subjects in an exam), and the appearance of papers on different subjects is also a subconscious reason why you didn't finish the papers. ...
Suggestion: Pre-test stress is a problem faced by almost every student. You can communicate with your family properly, so that they can understand your current difficulties and reduce your pressure. In addition, making all kinds of preparations first can also make you calmly face the exam (for example, what are you going to do if you don't do well in the exam), so that you won't worry too much and the pressure will naturally be reduced. There is also doing a little physical activity (fitness or something) every day to relieve brain pressure.
I hope my analysis can help you.