These essay topic examples are debatable, it is important to choose the topic that is interesting for you.
these are really good things for me 2 use at my school
A number of these topics are rather controversial and that's the point. In an argumentative essay, opinions matter and controversy is based on opinions, which are, hopefully, backed up by facts. If these topics are a little too controversial or you don't find the right one for you, try browsing through persuasive essay topics as well.
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.