I like how you separated the various topics by grade. Generally we focus on passing the essay portion of the GMAT with our students and try to just provide college-level topics.
Crafting a persuasive speech or writing a persuasive essay begins with picking the right topic. A good persuasive speech topic is one that you can use to grab the audience’s attention, inform and persuade, and provide a strong persuasive argument for adopting your point of view.
These essay topic examples are debatable, it is important to choose the topic that is interesting for you.