The context of the following conversation is Kai paid no attention to their teacher, who was covering topics to be included on the exam, as he played games on his phone.:
Kai says I think I'm going to fail this exam..
The friend responds Did you not study for it?.
Kai responds I don't even know what topics I have to study..
The friend responds How do you not know what to study?.
Kai responds I wasn't paying attention to my teacher in class, I was playing games on my phone..
The friend responds I don't think you should use your phone in class anymore..