Most of the events in the game are scripted to happen once per week. For example, Debbie may misbehave during morning class on Monday, but not during any other class time. You would find that that happens every single week without fail. Start remembering or take notes on what happens for each period of each day for the week, and you can begin planning what stats or events to work on each day.
In chapter 2 you should have the option to punish Liz, Faye and Priti in class. Until you complete Cassandra's, Amy's and Rachel's quests you can punish them to. Plus on Friday afternoon you can pick which girl to punish. So, there should be plenty of options. When a girl misbehaves focus on classroom punishments and public punishments to increase discipline. Also be sure to unlock all the rules and complete all the active quests.
