I remember studying (actually, not studying) Geology in middle school. That was one of the only quarters I didn't make the honor roll. In fact, I got a D. It was worth it. I did get a stern talking to from my dad though. This is what he said:

"You're going to get an A next quarter, right?"

I assured him I would, and I did. That was the end of it.

My kids aren't of the age to be writing essays yet, but I have discussed the topic with some co-workers, and I am convinced that the best thing to do is lie. If you get an essay question about "Of Mice and Men" then write about your cousin who is mentally challenged. If you are supposed to write about an olympic hero and your teacher wont be fact checking it, then make one up. Make him/her the type of hero you would have. For most essay questions there are kids who can relate it better to their own lives than others based on their family and experiences. Don't let the truth get in the way of a good essay.