There are some cartoons that show exaggerated situations or use humor to lighten the topic. They might be considered funny because they find a way to approach a serious subject in a light-hearted way.
You can start by looking at the symbols and imagery used. They often represent specific ideas or events. Also, consider the context of the time when it was created.
Often, such cartoons could highlight concerns about how merit is defined and whether it truly rewards effective teaching. They might also touch on potential inequalities or the influence of politics on the process.