There was no concept of time in dreams, so Furuhashi Sakurakyu was unsure of how much time had passed.
When she picked up Akino's finished paper and checked carefully, her eyes were filled with shock.
The answers were all correct.
Furuhashi Sakurakyu's grades were not that good when she was attending school, but she still had some education as an adult afterward. Even though her grades were average, she could understand a bit of high school knowledge, so she still remembered some of them even now. Additionally, she saw these questions and their respective answers before, so she knew that Akino's answers were all correct.
Even though it was just a dream and dreams are unpredictable, as mentioned before, it still reflects on events from reality. If Akino did not know how to solve these questions, in reality, it would be impossible for her to solve these questions even in her dreams because knowledge could not just appear from thin air.
