Back when I was on my exchange trip to a Japanese high school, I used my free periods between classes to try and study Japanese stuff. A note to prospective Japanese exchange trip learners--there's NOTHING better you can do than study Japanese where teachers and students can see you. It shows the teachers and the students that you're making an effort to learn their language and better integrate yourself into their society. I found it was also a wonderful counter for any time any student/teacher...