After getting attendance up, Candice will ask the player character to teach for a day about their adventures. The player character's intelligence will dictate how much and how well he confers his experiences, as well as how much XP the player character gets. Charisma will also play a role, naturally.
Character type completion breakdown
Combat Boy - I suppose he can shoot the students, but that might not sit too well with the authorities.
Diplomacy, Stealth, Science Boy - It helps to be charismatic while instructing, otherwise the kids will fall asleep, or throw spit wads at you while you're not looking.