Psychology - Biopsychology Topic Test - How to postpone? Watch

So our class (only 4 people including me) are going to do biopsychology end of topic test tomorrow. However, all of us find it extremely hard and agreed this is the hardest topic of out all. Even my teacher's upper sixth students agreed and they had to do extra preparation for it for their A-level exams.

But our psychology teacher postponed it from Friday to Monday as we didn't finish the topic yet and then he postponed it from Monday to Tuesday. But it's so hard that it's unbelievable. We want to show him we are capable of doing it.

Do you think it would be possible if we could ask him to post pone it to Wednesday?