Ghost or kidnapper

Claire thought that it would be better if she joins the other girls.

It would work as a competition and they would be able to focus on their studies better.

Even though they ended up talking more than half of the time, the amount of work they got done was more than rest of the days.

When they are alone, they would often feel distracted and lose the motivation of studying.

Or they would start craving for some food and start preparing for that.

Then they would feel full after eating that and feel sleepy.

Again, leading to getting less work done.

But as a group, even if one was lacking motivation, another would say a few words to get others fueled with motivation.

Around 12, there was a knock at the door and everyone looked at each other.

"Could it be that someone magically decided to send me pizza because I have been working really hard?" Claire said with a dramatic hand move.