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.