Is there any big mistake you've made recently?

Vidhi: I have to study for my exams but I don't know why I am working hard for my project.. God! I want good grades~!
Yingying:  My biggest mistake is being in the wrong group of people who is irresponsible! and they blame me for everything too~
Eriibon: 
Aqua:
Haruka:
Sakura:
Misha: