In terms of interaction, theres three main areas that the app is tied around:
Rewards, meaning the trading cards,
Challenges, a list of challenges set by the teacher that will get student a reward
and Community, your social circle whether its friends you add or have on Facbeook and Twitter.
The teacher's application is much more of a managment tool,
a list of students grouped by class and year group is presented and teacher can oversee how his students perform.