The context of the following conversation is Kai had a big exam coming up soon. Kai spent some time reading a book.:
Kai says My big exam is next week.  I am stressed about it..
The friend responds Have you been studying for it?.
Kai responds Not as much as I need to, but I'll put in the hours this weekend..
The friend responds Why don't you start now?.
Kai responds I am reading a book that I want to finish.  It's getting exciting..
The friend responds Cool.  You've always loved to read..